ZSSC1956 Datasheet, PDF (1/215 Pages) Integrated Device Technology – Intelligent Battery Sensor IC

Intelligent Battery Sensor IC
ZSSC1956
Datasheet
Brief Description
The ZSSC1956 IC is a dual-channel analog-to-digital
converter (ADC) with an embedded microcontroller
for battery sensing/management in automotive,
industrial, and medical systems.
One of the two input channels measures the battery
current IBAT via the voltage drop at the external
shunt resistor. The second input channel measures
the battery voltage VBAT and the temperature. An
integrated flash memory is provided for customer-
specific software; e.g., dedicated algorithms for
calculating the battery state.
During Sleep Mode (e.g., engine is off), the system
makes periodic measurements to monitor the dis-
charge of the battery. Measurement cycles are
controlled by the software and include various wake-
up conditions. The ZSSC1956 is optimized for ultra-
low power consumption and draws only 100µA or
less in Low-Power Mode.
Features
• High-precision 24-bit sigma-delta ADC (18-bit
with no missing codes); sample rate: 1Hz – 16kHz
• On-chip voltage reference (5ppm/K typical)
• Current channel
 IBAT offset error: ≤ 10mA
 IBAT resolution: ≤ 1mA
 Programmable gain: 4 to 512
 Differential input stage input range: ± 300mV
• Voltage channel
 Input range: 4 to 28.8V
 Voltage accuracy: better than ±2mV
• Temperature channel
 Internal temperature sensor: ± 2°C
 External temperature sensor (NTC)
• On-chip precision oscillator (1%) and on-chip
low-power oscillator
• ARM^® Cortex™-M0* microcontroller:
32-bit core, 10MHz to 20MHz
• 96kB Flash/EE Memory with ECC, 8kB SRAM
• LIN2.2 / SAE J2602-2 compliant
• Directly connected to 12V battery supply
• Normal Mode current consumption: 10mA to 20mA
• Low-Power Mode current consumption: ≤ 100µA
© 2016 Integrated Device Technology, Inc.
Benefits
• Integrated, precision measurement solution for
accurate prediction of battery state of health
(SOH), state of charge (SOC) or state of function
(SOF)
• Flexible wake-up modes allow minimum power
consumption without sacrificing performance
• No temperature calibration or external trimming
components required
• Optimized code density through small instruction
set architecture Thumb^®-2 *
• Robust power-on-reset (POR) concept for harsh
automotive environments
• Industry’s smallest footprint allows minimal
module size and cost
• AEC-Q100 qualified solution
Available Support
• Evaluation Kit
• Application Notes
Physical Characteristics
• Wide operation temperature: -40°C to +125°C
• Supply voltage: 4.2 to 18V
• Small footprint package: PQFN32 5x5 mm
Basic ZSSC1956 Application Circuit
+ - ^{To Harness}
Car Chassis Ground
Rshunt
f
+-
Battery
VBAT
VDDE
INP
INN
Host
LIN
Controller
LIN
Interface
VDDA _ZSSC1956
NTH
NTC
5
GPIO
NTL _{VSSA VSSE}
Optional
GPIO:
SPI, I²C™,
UART
Module Ground
* The ARM^®, Cortex™, and Thumb^®-2 trademarks are owned by ARM, Ltd.
The I²C™ trademark is owned by NXP.
1
January 29, 2016