Automotive Sensor Signal
Conditioner with Analog Output
ZSSC4151
Datasheet
Contents
1
2
Brief Description ............................................................................................................................................... 2
Electrical Characteristics .................................................................................................................................. 3
2.1. Absolute Maximum Ratings ....................................................................................................................... 3
2.2. Operating Conditions ................................................................................................................................. 4
2.3. Electrical Parameters ................................................................................................................................ 5
2.3.1. Supply Current and System Operation Conditions ............................................................................. 5
2.3.2. Analog Front-End Characteristics ....................................................................................................... 5
2.3.3. Temperature Measurement ................................................................................................................ 5
2.3.4. Sensor Diagnostics ............................................................................................................................. 6
2.3.5. A2D Conversion .................................................................................................................................. 6
2.3.6. DAC and Analog Output (AOUT Pin) .................................................................................................. 6
2.3.7. System Response ............................................................................................................................... 7
2.4. Interface Characteristics and Nonvolatile Memory .................................................................................... 8
2.4.1. I
2
C
TM
Interface ..................................................................................................................................... 8
2.4.2. ZACwire™ One-Wire Interface (OWI at AOUT pin) ............................................................................ 8
2.4.3. Nonvolatile Memory (NVM) ................................................................................................................. 9
ESD Protection and EMC Specification ......................................................................................................... 10
3.1. ESD Protection ........................................................................................................................................ 10
3.2. Latch-Up Immunity .................................................................................................................................. 10
3.3. Electromagnetic Emission ....................................................................................................................... 10
3.4. Conducted Susceptibility (DPI) ................................................................................................................ 10
Reliability and RoHS Conformity .................................................................................................................... 11
Glossary ......................................................................................................................................................... 11
Document Revision History ............................................................................................................................ 12
3
4
5
6
List of Figures
Figure 1.1
ZSSC4151 Block Diagram .................................................................................................................. 2
List of Tables
Table 2.1
Table 2.2
Table 2.3
Table 2.4
Table 3.1
Absolute Maximum Ratings ................................................................................................................ 3
Operating Conditions .......................................................................................................................... 4
Electrical Parameters .......................................................................................................................... 5
Interface Characteristics and Nonvolatile Memory ............................................................................. 8
Conducted Susceptibility (DPI) Tests ............................................................................................... 10
© 2016 Integrated Device Technology, Inc.
1
April 20, 2016
ZSSC4151 Datasheet
1
Brief Description
The ZSSC4151 sensor signal conditioner (SSC) is a CMOS integrated circuit for highly accurate amplification and
sensor-specific correction of bridge sensor signals. Digital compensation of sensor offset, sensitivity, temperature
drift, and non-linearity is accomplished via an internal 16-bit RISC microcontroller running a correction algorithm
with calibration coefficients stored in an EEPROM.
The ZSSC4151 is adjustable to nearly all bridge sensor types. Measured values are provided at the analog
voltage output and at the digital I
2
C™* or ZACwire™ interface, also referred to as the One-Wire Interface (OWI).
The digital interfaces can be used for a simple PC-controlled calibration procedure in order to program a set of
calibration coefficients into an on-chip EEPROM. The specific sensor and the ZSSC4151 can be quickly
calibrated together. The ZSSC4151 and the calibration equipment communicate digitally, so the noise sensitivity
is greatly reduced. Digital calibration helps keep assembly cost low as no trimming by external devices or lasers is
needed.
The ZSSC4151 is optimized for automotive environments by overvoltage and reverse-polarity protection circuitry,
excellent electromagnetic compatibility, full automotive temperature range, and multiple diagnostic features.
Figure 1.1 provides a block diagram of the ZSSC4151. Refer to section 5 for definitions of abbreviations.
Figure 1.1 ZSSC4151 Block Diagram
ZSSC4151
TS1
External PN
Temp Sensor
SCL
IC
2
TM
SDA
VDDA
VSSA
TOP
Mode
Input
Select
Power
Management
NVM
Gain
Select
ADC
Mode
Sensor
Bridge
BR1P
RAM
ADC
CMC
ZACwire
TM
AOUT
OWI
MUX
SCCM
BR1N
PGA
DAC /
BAMP
Interfaces
Temp
Sensor
BOT
Analog
Front-End
(AFE)
ROM
Digital Core
Overvoltage
Protection
VDDE
VSSE
Alternate External
Temperature
Sensor 2
TS2
* I
2
C™ is a trademark of NXP.
© 2016 Integrated Device Technology, Inc.
2
April 20, 2016
ZSSC4151 Datasheet
2
Electrical Characteristics
Important note:
The
absolute maximum ratings
given in section 2.1 are stress ratings only. The ZSSC4151 might
not function or be operable above the
recommended operating conditions.
Stresses exceeding the
absolute
maximum ratings
might also damage the device. In addition, extended exposure to stresses above the
recommended operating conditions
might affect device reliability. IDT does not recommend designing to the
specifications given under “Absolute Maximum Ratings.”
Important note:
The
operating conditions
given in section 2.2 set the conditions over which IDT specifies device
operation. These are the conditions that the application circuit should provide to the device for it to function as
intended. Unless otherwise noted, the limits for parameters that appear in the
operating conditions
section are
used as test conditions for the limits given in the
electrical characteristics
(section 2.3),
operating conditions, and
interface characteristics and nonvolatile memory
sections.
2.1.
No.
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
Absolute Maximum Ratings
Absolute Maximum Ratings
Parameter
Supply voltage
Voltage at AOUT pin
Analog supply voltage
Digital supply voltage
Voltage at all other pins
Storage temperature
Symbol
VDDE
V
AOUT
VDDA
VDD
V
PIN
T
STG
Conditions
Min
-40
-40
-0.3
-0.3
-0.3
-55
Max
40
40
6.5
1.98
VDDA +0.3
160
Unit
VDC
VDC
VDC
VDC
V
C
Table 2.1
© 2016 Integrated Device Technology, Inc.
3
April 20, 2016
ZSSC4151 Datasheet
2.2.
Operating Conditions
Operating Conditions
Parameter
Supply voltage
Symbol
VDDE
VDDA
Conditions
To VSSE
To VSSA
VDDE minus drop through
protection switch
Extended Temperature
Range (TQE)
Advanced-Performance
Temperature Range (TQA)
Best-Performance
Temperature Range (TQI)
Min
4.5
(VDDE – 0.1)
All voltages in this section are relative to VSSA.
Table 2.2
No.
2.2.1
Note: See important notes at the end of the table.
Typical
5
Max
5.5
VDDE
Unit
V
V
2.2.2
Junction temperature
T
TQE
T
AMB_TQA
T
AMB_TQI
-40
-40
-25
2
150
125
85
10
15
C
C
C
k
k
2.2.3
Bridge resistance
1), 2)
R
BR
R
BR_10-90
Output range 10-90%
1
1)
2)
No measurement in mass production; parameter is guaranteed by design and/or quality observation.
R
BR
greater than the maximum limit results in higher noise.
© 2016 Integrated Device Technology, Inc.
4
April 20, 2016
ZSSC4151 Datasheet
2.3.
Electrical Parameters
All parameter values in this section are valid under the operating conditions specified in section 2.2. All voltages
referenced to VSSA.
Note: All parameters measured/validated for r
ADC
= 14-bit; segmentation of 1
st
and 2
nd
ADC stage = 8/6;
f
OSC
= 8MHz; analog gain = ~100; T
AMB_TQE
(see specification 2.2.2).
Table 2.3
Electrical Parameters
Note: See important table notes at the end of the table (page 7).
No.
2.3.1.
2.3.1.1
2.3.1.2
2.3.1.3
2.3.1.4
2.3.2.
2.3.2.1
2.3.2.2
2.3.2.3
2.3.2.4
2.3.3.
2.3.3.1
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Supply Current and System Operation Conditions
Supply current
1)
Sensor bridge supply
voltage
Oscillator frequency
2)
Oscillator frequency
temperature coefficient
I
S
V
SENS
f
OSC
TC
OSC
Oscillator adjusted
(typical f
OSC
= 8MHz).
V
SENS
= V
TOP
- V
BOT
at R
BR
≥ 2k
0.9
7.2
-200
8
5.5
7
1
8.8
200
mA
VDDA
MHz
ppm/K
Analog Front-End Characteristics
Input span
Common mode input range
External capacitance at
input
Input leakage current
3)
Temperature Measurement
PTAT internal temperature
sensitivity
External temperature diode
channel gain
External temperature diode
bias current
External temperature diode
input range
3)
ST
TSI
Raw values, without
conditioning calculation
Analog gain setting= 6
20
LSB
14
/K
LSB
14
/mV
20
40
-0.2
A
V
V
IN_SPAN
V
IN_CM
C
IN_EXT
I
IN_leak
Analog gain = 1 to 200
Depends on gain adjustment
Capacitance at pins BR1P
and BR1N to VSSA
1
0.25
0
-15
800
0.75
12
15
mV/V
V
SENS
nF
nA
2.3.3.2
2.3.3.3
2.3.3.4
A
TSE_D
I
TSE_D
V
TSE_D
Relative to V
TOP
10
10
-1
© 2016 Integrated Device Technology, Inc.
5
April 20, 2016
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