silicon oscillators with a frequency error less than 0.09%.
For each oscillator, the user can select one of 8 frequen-
cies between 32.768kHz and 8.192MHz. Based on a fixed
master oscillator frequency, internal frequency dividers
between 1 and 128 provide the 8 different frequencies.
The LTC6930 requires no external components other than
power supply bypass capacitors. Requiring only a single
1.7V to 5.5V supply enables operation from a single Li-Ion
cell or 2 AA alkaline cells.
The LTC6930 features a proprietary control architecture
that allows for ultralow power operation while maintaining
industry leading accuracy and jitter specifications. The
exceptionally fast start-up time, combined with the low
power consumption, is ideal for battery operated applica-
tions with frequent power-up cycles.
Any frequency from 32.768kHz to 8.192MHz can be pro-
vided by the factory. Minimum order sizes apply for custom
frequencies. Please consult LTC Marketing for details.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 6342817, 6614313.
n
n
Frequency Error <0.09% Max at 25°C
Start-Up Time <110µs at All Frequencies
1.7V to 5.5V Single Supply Operation
105µA Typical Supply Current at 32kHz, V
+
= 3V
490µA Typical Supply Current at 8MHz, V
+
= 3V
Typical RMS Period Jitter <0.15% at V
+
= 3V
No External Components to Set Frequency
5 Options Cover 32.768kHz to 8.192MHz:
LTC6930-4.19: 4.194304MHz ÷ N
LTC6930-5.00: 5.000000MHz ÷ N
LTC6930-7.37: 7.372800MHz ÷ N
LTC6930-8.00: 8.000000MHz ÷ N
LTC6930-8.19: 8.192000MHz ÷ N
Where N = 1, 2, 4, 8, 16, 32, 64, 128
(N Determined by State of DIVA, DIVB, DIVC Pins)
–55°C to 125°C Operating Temperature Range
Tiny 2mm
3mm DFN or MS8 Package
applicaTions
n
n
n
n
Digitally Controlled Oscillator
Microprocessor Clock
Power Supply Clock
Portable and Battery Operated Devices
Typical applicaTion
4MHz Micropower Clock Generator
V
+
= 1.7V TO 5.5V
I
S
= 325µA AT 3V
DC
70
Typical Frequency Error Distribution
T
A
= 25°C
V
+
= 3V
60 DIV = 0
1045 UNITS
50
UNITS
40
30
20
0.1µF
V
+
V
+
4MHz
DIVA
OUT
LTC6930-8.00
DIVB
DIVC
GND
GND
10
0
–0.10
–0.05
0
0.05
FREQUENCY ERROR (%)
0.10
6930 TA01b
6930 TA01a
6930fe
For more information
www.linear.com/LTC6930
1
LTC6930-X.XX
absoluTe MaxiMuM raTings
(Note 1)
Total Supply Voltage
(V
+
to GND) ............................................. –0.3V to 6V
Any Input Pin to GND
(DIV Pins) ......................................–0.3V to V
+
+ 0.3V
Operating Temperature Range (Note 2)
LTC6930C ............................................ –40°C to 85°C
LTC6930I.............................................. –40°C to 85°C
LTC6930H .......................................... –40°C to 125°C
LT6930MP.......................................... –55°C to 125°C
Specified Temperature Range (Note 3)
LTC6930C ................................................ 0°C to 70°C
LTC6930I.............................................. –40°C to 85°C
LTC6930H .......................................... –40°C to 125°C
LT6930MP.......................................... –55°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
pin conFiguraTion
TOP VIEW
V
+
1
GND 2
DIVA 3
DIVB 4
9
8 V
+
7 OUT
6 GND
5 DIVC
TOP VIEW
V
+
GND
DIVA
DIVB
1
2
3
4
8
7
6
5
V
+
OUT
GND
DIVC
DCB PACKAGE
8-LEAD (2mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 64°C/W
EXPOSED PAD (PIN 9) MUST BE SOLDERED TO GND
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 300°C/W
(SINGLE-LAYER BOARD)
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
LTC6930CDCB-4.19#TRMPBF
LTC6930IDCB-4.19#TRMPBF
LTC6930HDCB-4.19#TRMPBF
LTC6930CDCB-5.00#TRMPBF
LTC6930IDCB-5.00#TRMPBF
LTC6930HDCB-5.00#TRMPBF
LTC6930CDCB-7.37#TRMPBF
LTC6930IDCB-7.37#TRMPBF
LTC6930HDCB-7.37#TRMPBF
LTC6930CDCB-8.00#TRMPBF
LTC6930IDCB-8.00#TRMPBF
LTC6930HDCB-8.00#TRMPBF
LTC6930CDCB-8.19#TRMPBF
LTC6930IDCB-8.19#TRMPBF
LTC6930HDCB-8.19#TRMPBF
TRM = 500 pieces.
TAPE AND REEL
LTC6930CDCB-4.19#TRPBF
LTC6930IDCB-4.19#TRPBF
LTC6930HDCB-4.19#TRPBF
LTC6930CDCB-5.00#TRPBF
LTC6930IDCB-5.00#TRPBF
LTC6930HDCB-5.00#TRPBF
LTC6930CDCB-7.37#TRPBF
LTC6930IDCB-7.37#TRPBF
LTC6930HDCB-7.37#TRPBF
LTC6930CDCB-8.00#TRPBF
LTC6930IDCB-8.00#TRPBF
LTC6930HDCB-8.00#TRPBF
LTC6930CDCB-8.19#TRPBF
LTC6930IDCB-8.19#TRPBF
LTC6930HDCB-8.19#TRPBF
PART MARKING*
LCKT
LCKT
LCKT
LCKV
LCKV
LCKV
LCKW
LCKW
LCKW
LCKX
LCKX
LCKX
LCKY
LCKY
LCKY
PACKAGE DESCRIPTION
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
8-Lead (2mm
3mm) Plastic DFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
6930fe
2
For more information
www.linear.com/LTC6930
LTC6930-X.XX
orDer inForMaTion
LEAD FREE FINISH
LTC6930CMS8-4.19#PBF
LTC6930IMS8-4.19#PBF
LTC6930HMS8-4.19#PBF
LTC6930MPMS8-4.19#PBF
LTC6930CMS8-5.00#PBF
LTC6930IMS8-5.00#PBF
LTC6930HMS8-5.00#PBF
LTC6930MPMS8-5.00#PBF
LTC6930CMS8-7.37#PBF
LTC6930IMS8-7.37#PBF
LTC6930HMS8-7.37#PBF
LTC6930MPMS8-7.37#PBF
LTC6930CMS8-8.00#PBF
LTC6930IMS8-8.00#PBF
LTC6930HMS8-8.00#PBF
LTC6930MPMS8-8.00#PBF
LTC6930CMS8-8.19#PBF
LTC6930IMS8-8.19#PBF
LTC6930HMS8-8.19#PBF
LTC6930MPMS8-8.19#PBF
TAPE AND REEL
LTC6930CMS8-4.19#TRPBF
LTC6930IMS8-4.19#TRPBF
LTC6930HMS8-4.19#TRPBF
LTC6930MPMS8-4.19#TRPBF
LTC6930CMS8-5.00#TRPBF
LTC6930IMS8-5.00#TRPBF
LTC6930HMS8-5.00#TRPBF
LTC6930MPMS8-5.00#TRPBF
LTC6930CMS8-7.37#TRPBF
LTC6930IMS8-7.37#TRPBF
LTC6930HMS8-7.37#TRPBF
LTC6930MPMS8-7.37#TRPBF
LTC6930CMS8-8.00#TRPBF
LTC6930IMS8-8.00#TRPBF
LTC6930HMS8-8.00#TRPBF
LTC6930MPMS8-8.00#TRPBF
LTC6930CMS8-8.19#TRPBF
LTC6930IMS8-8.19#TRPBF
LTC6930HMS8-8.19#TRPBF
LTC6930MPMS8-8.19#TRPBF
PART MARKING* PACKAGE DESCRIPTION
LTCKZ
LTCKZ
LTCKZ
LTCKZ
LTCLB
LTCLB
LTCLB
LTCLB
LTCLC
LTCLC
LTCLC
LTCLC
LTCLD
LTCLD
LTCLD
LTCLD
LTCLF
LTCLF
LTCLF
LTCLF
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
8-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.*Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ac elecTrical characTerisTics
SYMBOL
Δfi
Δf
PARAMETER
Initial Frequency Accuracy
Frequency Accuracy
(Note 4)
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, specifications apply over the full range of
operating supply voltage and frequency output: V
+
= 1.7V to 5.5V and all DIV settings with C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
TYP
0.08
l
l
l
l
l
l
l
l
l
l
l
l
MAX
0.09
±0.45
±0.65
±1
±0.52
±0.65
±1.1
±0.8
±0.95
±1.3
UNITS
%
%
%
%
%
%
%
%
%
%
%/°C
%/°C
%/V
ppm/√kHr
6930fe
DIVA = DIVB = DIVC = 0, T
A
= 25°C, V
+
= 3V
V
+
= 3V – 3.6V
LTC6930C
LTC6930I
LTC6930H/LTC6930MP
V
+
= 2V – 3.6V
LTC6930C
LTC6930I
LTC6930H/LTC6930MP
V
+
= 1.7V – 5.5V
LTC6930C
LTC6930I
LTC6930H/LTC6930MP
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
±0.1
0.0001
0.001
0.07
30
Δf/ΔT
Δf/ΔV
Frequency Drift Over Temperature
Frequency Drift Over Supply
Long-Term Frequency Stability
MS8 Package
DCB Package
(Note 5)
l
For more information
www.linear.com/LTC6930
3
LTC6930-X.XX
ac elecTrical characTerisTics
SYMBOL
PARAMETER
RMS Period Jitter
CONDITIONS
DIVA = DIVB = DIVC = 0, V
+
= 3V
LTC6930-4.19 (4.194304MHz)
LTC6930-5.00 (5.000000MHz)
LTC6930-7.37 (7.372800MHz)
LTC6930-8.00 (8.000000MHz)
LTC6930-8.19 (8.192000MHz)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, specifications apply over the full range of
operating supply voltage and frequency output: V
+
= 1.7V to 5.5V and all DIV settings with C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
TYP
320
1.7
225
1.2
180
0.97
130
0.8
130
0.8
MAX
UNITS
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
ps RMS
ns
P-P
Dc elecTrical characTerisTics
SYMBOL
V
S
I
S,DC
PARAMETER
Supply Voltage Applied Between
V
+
and GND
V
+
Combined Supply Current
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, specifications apply over the full range of
operating supply voltage and frequency output: V
+
= 1.7V to 5.5V and all DIV settings with C
LOAD
= 5pF R
LOAD
= ∞.
,
l
MIN
1.7
TYP
MAX
5.5
290
420
750
160
190
355
430
570
960
176
212
375
480
660
1310
220
273
440
520
740
1380
240
295
475
490
760
1400
270
325
540
1.4
UNITS
V
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
6930fe
LTC6930-4.19
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-5.00
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
170
260
490
80
105
130
201
307
579
95
124
154
296
453
853
139
183
226
321
491
926
151
198
246
310
500
880
150
190
210
1.25
I
S,DC
V
+
Combined Supply Current
LTC6930-7.37
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-8.00
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
LTC6930-8.19
DIVA = DIVB = DIVC = 0, V
+
= 1.7V
DIVA = DIVB = DIVC = 0, V
+
= 3V
DIVA = DIVB = DIVC = 0, V
+
= 5.5V
DIVA = DIVB = DIVC = 1, V
+
= 1.7V
DIVA = DIVB = DIVC = 1, V
+
= 3V
DIVA = DIVB = DIVC = 1, V
+
= 5.5V
V
IH
Minimum High Level Input Voltage,
All Digital Input Pins
4
For more information
www.linear.com/LTC6930
LTC6930-X.XX
Dc elecTrical characTerisTics
SYMBOL
V
IL
I
IN
R
OUT
V
OH
PARAMETER
Maximum Low Level Input Voltage,
All Digital Input Pins
Digital Input Leakage Current, All
Digital Input Pins
Output Resistance
High Level Output Voltage
CONDITIONS
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, specifications apply over the full range of
operating supply voltage and frequency output: V
+
= 1.7V to 5.5V and all DIV settings with C
LOAD
= 5pF R
LOAD
= ∞.
,
MIN
0.7
TYP
1.25
MAX
UNITS
V
µA
Ω
V
V
V
V
V
V
V
V
0.1
0.1
0.1
0.7
0.5
0.35
V
V
V
V
V
V
V
V
0 < V
IN
< V
+
OUT Pin, V
+
= 3V
DIVA = DIVB = DIVC = 0, No Load
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, 1kΩ Load to GND
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, No Load
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
DIVA = DIVB = DIVC = 0, 1kΩ Load to V
+
V
+
= 5.5V
V
+
= 3V
V
+
= 2V
V
+
= 1.7V
l
±1
40
l
l
l
5.4
2.9
1.8
5
2.6
1.5
5.5
3
2
1.7
5.2
2.7
1.6
1.5
0
0
0
0
0.3
0.3
0.3
0.3
l
l
l
V
OL
Low Level Output Voltage
l
l
l
l
l
l
TiMing characTerisTics
SYMBOL
t
rf
DCY
PARAMETER
Duty Cycle
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. Unless otherwise noted, specifications apply over the full range of operating supply
voltage and frequency output: V
+
= 1.7V to 5.5V and f
OUT
= 32.768kHz to 8.192MHz with C
LOAD
= 5pF R
LOAD
= ∞.
,
CONDITIONS
DIVA = DIVB = DIVC = 0; V
+
= 2V to 5.5V
DIVA = DIVB = DIVC = 0
DIVA or DIVB or DIVC ≠ 0
Edge of DIV Signal to 1st Accurate Output Cycle
V
+
> 1.7V to 1st Accurate Output Cycle
l
l
l
l
MIN
35
35
48
TYP
3
50
50
50
1
MAX
65
70
52
110
UNITS
ns
%
%
%
Cycle
µs
Output Rise/Fall Time (10% to 90%) V
+
= 3V
D
DIV
D
PON
DIV to OUT Delay
Power On Delay
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
LTC6930C is guaranteed functional over the operating range of
–40°C to 85°C.
Note 3:
The LTC6930C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6930C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC6930I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6930H is guaranteed
to meet specified performance from –40°C to 125°C. The LTC6930MP is
guaranteed to meet specified performance from –55°C to 125°C.
Note 4:
Frequency accuracy and frequency drift are defined as deviation
from the nominal frequency or the nominal frequency divided by the
integer set through the DIV pins for each part. The nominal frequency for
the LTC6930 family of parts are defined as follows:
LTC6930-4.19
f
NOM
= 4.194304MHz
LTC6930-5.00
f
NOM
= 5.000000MHz
LTC6930-7.37
f
NOM
= 7.372800MHz
LTC6930-8.00
f
NOM
= 8.000000MHz
LTC6930-8.19
f
NOM
= 8.192000MHz
Note 5:
Long-term drift of silicon oscillators is primarily due to the
movement of ions and impurities within the silicon and is tested at 30°C
under otherwise nominal operating conditions. Long-term drift is specified
as ppm/√kHr due to the typically non-linear nature of the drift. To calculate
drift for a set time period, translate that time into thousands of hours,
take the square root and multiply by the typical drift number. For instance,
a year is 8.77kHr and would yield a drift of 89ppm at 30ppm/√kHr. Drift
without power applied to the device may be approximated as 1/10th of the
drift with power, or 3ppm/√kHr for a 30ppm/√kHr device.
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I encountered a very strange problem today, I hope the big guys can help me with the following problem:
Use the TIM3_CH2 channel of stm32 to output pwm to control the motor. The driver board is tb6621...
I am a novice who has just come into contact with ARMCortex. I want to use LM3S9B96 to make an embedded industrial product with a 7-inch TFT touch screen. The two screens I am interested in are from T...
introduction
With the continuous optimization of surface mount technology (SMT) and the rapid development of chip component manufacturing technology, the application of chip mounters in the el...[Details]
This article discusses how to wake up a touch-sensitive device such as a tablet without touching the device, using basic gesture recognition and novel proximity sensors. The article discusses the p...[Details]
1. Introduction
Automobile pollution is one of the most important issues that people are most concerned about and need to solve urgently. As an important method for detecting automobile exhau...[Details]
Do you often have to add brake fluid to your car's brakes? The fact that you need to pump out the brake fluid to make sure there is no gas in the brake fluid line may not be done by the car owner h...[Details]
System design is a complex process. It is not enough to just use ICs. There are many details to consider. This article uses a high-fidelity music playback system as an example to introduce how to s...[Details]
For a long time, due to the limitation of hardware conditions, the display devices of traditional small handheld devices such as PDA are usually monochrome LCD, and the user interface is very simpl...[Details]
Power management solutions for today's portable application processors are becoming increasingly integrated. Total power consumption, standby and sleep current consumption affect battery size, bill...[Details]
General LED lighting has a current limiting resistor in the driving circuit, and the power consumed by the resistor has nothing to do with the LED light emission. In order to improve efficiency, a...[Details]
Nippon Electric Works and Volvo Technology Japan have developed a wireless power supply system for electric vehicles (EVs). Using this system, the two companies have successfully conducted an exper...[Details]
To understand how and why OLED power supply affects display image quality, you must first understand OLED display technology and power supply requirements. This article will explain the latest OLED...[Details]
introduction
Incandescent bulbs can emit a variety of light, but in specific applications, only green, red, and yellow light are usually needed - such as traffic lights. If an incand...[Details]
Introduction
As the country increases its efforts to control the atmospheric environment, motorcycle emission regulations will become stricter year by year, and motorcycles that do not meet the...[Details]
Introduction
In industrial control, speed measurement is often required. Generally, a contact tachometer is used. This tachometer must be placed against the center of the shaft to measure. It...[Details]
Currently, each country is developing its own USB interface
charging specifications
, which leads to a major problem that a USB interface
charging
device manufactured in one country...[Details]
In the "digital pressure measurement" experimental device of applied physics, the subject technical knowledge of analog circuits, digital circuits, sensors and single-chip microcomputers is used. In o...[Details]
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