Modes of Operation .............................................................................................................................................. 12
Current, Voltage and Temperature Measurement .................................................................................................. 14
Power Measurement ............................................................................................................................................. 14
Charge, Energy Measurement and Accumulated Time ......................................................................................... 14
Applications Information .......................................................................................................15
Configuring the GPIO Pin...................................................................................................................................... 15
Internal Sense Resistor ......................................................................................................................................... 16
Current and Voltage Input Filtering ....................................................................................................................... 16
C Mode .............................................................................................................................................................. 22
PAGE Control ........................................................................................................................................................ 26
Operation Control ................................................................................................................................................. 26
LTC2947I ............................................... –40° to 85°C
Storage Temperature Range .................... –65° to 150°C
32 31 30 29 28 27
IM 1
IM 2
IM 3
IM 4
IM 5
IM 6
AGND 7
DGND 8
AD0 9
AD1/CS 10
UFE PACKAGE
VARIATION: UFE32MA
32-LEAD PLASTIC QFN (4mm
×
6mm)
T
JMAX
= 125°C,
θ
JA
= 50°C/W
EXPOSED PAD (PIN 33); DO NOT CONNECT
EXPOSED PAD (PIN 34) IS DGND, MAY BE CONNECTED TO DGND OR LEFT FLOATING
ORDER INFORMATION
TUBE
LTC2947IUFE#PBF
TAPE AND REEL
LTC2947IUFE#TRPBF
PART MARKING*
2947
PACKAGE DESCRIPTION
32-Lead (4mm
×
6mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. B
For more information
www.analog.com
3
LTC2947
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL
Power Supply
V
AVCC
, V
DVCC
Supply Voltage
V
OVDD
V
UVLO
I
AVCC
Supply Voltage of Digital Interface
V
AVCC
, V
DVCC
Undervoltage Lockout
Threshold
Supply Current Analog Section
V
AVCC
, V
DVCC
Falling
Continuous Mode
Idle Mode
Shutdown Mode
Shutdown Mode
Continuous Mode
Idle Mode
Shutdown Mode
Shutdown Mode
V
OVDD
, V
AVCC
, V
DVCC
≥ 0.9 • V
OVDDfinal
(Note 8)
(Note 5)
(Note 6)
(Note 7)
Current through IP and IM = 30A
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
4.75
1.8
TYP
MAX
15
5.5
4.75
UNITS
V
V
V
mA
mA
μA
µA
mA
mA
μA
µA
ns
3
0.2
0.3
0.3
6
6
7
7
0
3.5
0.3
0.5
1
8
8
9.5
90
I
DVCC
Supply Current Digital Section
Delay of V
AVCC,DVCC
to V
OVDD
at
Power-Up
Current Sense (IP IM) ADC
,
Resolution (No Missing Codes)
I
SENSE
R
SENSE
Input Current Through IP and IM
Internal Sense Resistor
Sense Resistor Voltage
Common Mode Input Voltage Range
LSB
I
Current Sense Quantization Step
Current Gain Error
l
l
l
15
±30
140
–0.1
3
300
9
15.5
±0.75
±1
±3
±5
±0.3
±1
±1.5
120
320
10.5
450
Bit
A
µΩ
mV
V
mA
% of reading
% of reading
LSB
LSB
%
% of reading
% of reading
dB
nV
MHz
bit
15.5
15.5
2
±0.4
±2
±2
±0.5
V
V
mV
% of reading
LSB
LSB
% of reading
dB
5.25
MHz
l
I
OS
INL
I
TUE
I
Current Offset
l
Current Integral Nonlinearity
Total Unadjusted Error
Input DC Common Mode Rejection
RMS Noise
Sampling Rate
(Note 6)
|I| ≥ 6A (Note 6)
l
l
l
(Note 5)
Voltage Sense (VP VM) ADC
,
Resolution (No Missing Codes)
Common Mode Voltage
V
D
Input Differential Voltage Range
V
D
Quantization Step
Voltage Gain Error
Voltage Offset
INL
V
TUE
V
Voltage Integral Nonlinearity
Voltage Total Unadjusted Error
Input DC Voltage Common Mode
Rejection
Sampling Rate
V
D
≥ 4.0V
l
l
l
l
l
(Note 5)
V
VP
– V
VM
l
l
l
14
0
–0.3
70
Rev. B
4
For more information
www.analog.com
LTC2947
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL
PARAMETER
Resolution (No Missing Codes)
Full-Scale Power
Power Quantization Step
Power Gain Error
l
ELECTRICAL CHARACTERISTICS
Power Measurement
(Note 5)
CONDITIONS
l
MIN
18
TYP
MAX
UNITS
bit
450
50
±0.8
±1
±4
±6
±0.3
±0.5
±1.2
±1.5
5.25
Internal Clock
l
W
mW
% of reading
% of reading
LSB
LSB
% of reading
% of reading
% of reading
% of reading
MHz
±0.5
±1
±340
% of reading
% of reading
ppm
ms
% of reading
% of reading
% of reading
% of reading
% of reading
% of reading
% of reading
% of reading
bit
Power Offset
l
INL
P
TUE
P
Power Integral Nonlinearity
Power Total Unadjusted Error
Sampling Rate
|I| ≥ 6A, V
D
≥ 12V (Note 6)
l
|I| ≥ 6A, V
D
≥ 12V (Note 6)
l
Timing
TUE
TB
Time Base Total Unadjusted Error
Ideal External Clock or Ideal 4MHz
Crystal (Note 5)
t
UPDATE
TUE
E
Update Time of Result Registers
Energy Total Unadjusted Error
|I| ≥ 6A, V
D
≥ 12V, Ideal External Clock
(Note 6)
|I| ≥ 6A, V
D
≥ 12V, Internal Clock
(Note 6)
Charge Measurement
TUE
C
Charge Total Unadjusted Error
|I| ≥ 6A, Ideal External Clock (Note 6)
Energy Measurement
l
l
95
100
105
±1.2
±1.5
±1.5
±2.5
±1
±1.5
±1.5
±2.5
l
l
l
|I| ≥ 6A, Internal Clock (Note 6)
l
Temperature Measurement ADC
Resolution (No Missing Codes)
Temperature Quantization Step
Temperature Error
V
ITH
I
IN
C
IN
V
OL
V
OH
Logic Input Threshold
Input Current SCL, SDI, GPIO
Input Capacitance
Low Level Output Voltage SDO, GPIO,
ALERT
High Level Output Voltage (SDO)
CLKI Input Threshold
External Clock Frequency on Pin CLKI
(Note 5)
V
OVDD
≥ 3.3V, I
PIN
= 3mA
1.8V ≤ V
OVDD
< 3.3V, I
PIN
= 1mA
I
SDAO
= –0.5mA
(Note 5)
SCL, SDI, GPIO,
CS,
ADO
l
l
l
l
l
l
l
l
(Note 5)
l
13
0.204
±5
0.3 • V
OVDD
0.7 • V
OVDD
±1
10
0.4
0.4
V
OVDD
– 0.5
0.4
0.2
0.7
2
25
°C
K
V
μA
pF
V
V
V
V
MHz
Digital Inputs and Digital Outputs SCL, SDI, GPIO,
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