ZSSC1750 Datasheet, PDF (1/116 Pages) Integrated Device Technology – Data Acquisition System Basis Chip

Data Acquisition
System Basis Chip
ZSSC1750 / ZSSC1751
Datasheet
Brief Description
The ZSSC1750 and ZSSC1751 are System Basis
Chips (SBCs) with a dual-channel ADC for battery
sensing/management in automotive, industrial, and
medical systems. The ZSSC1750 and ZSSC1751
feature an SPI interface; in addition, the ZSSC1750
has an integrated LIN 2.1 transceiver.
One of the two input channels measures the battery
current I_BAT via the voltage drop at the external shunt
resistor. The second channel measures the battery
voltage V_BAT and the temperature.
By simultaneously measuring V_BAT and I_BAT, it is
possible to determine dynamically the internal
resistance of the battery, Rdi, which is correlated
with the state-of-health (SOH) of the battery. By
integrating I_BAT, it is possible to determine the state-
of-charge (SOC) and the state-of-function (SOF) of
the battery.
During Sleep Mode, the system makes periodic
measurements to monitor the discharge of the
battery. Measurement cycles are controlled by user
software and include various wake-up conditions.
The ZSSC1750/51 is optimized for ultra-low power
consumption drawing only 60µA or less in this mode.
Features
• Two high-precision 24-bit sigma-delta ADCs
(18-bit with no missing codes);
sample rate: 1Hz to 16kHz
• On-chip voltage reference (5ppm/K typical)
• Current channel
 I_BAT offset error: ≤ 10mA
 I_BAT resolution: ≤ 1mA
 Programmable gain: 4 to 512
 Max. differential input stage input range: ±300mV
• Voltage channel
 Input range: 4 to 28.8V
 Voltage accuracy: ±60ppm FSR* = 1.73mV
• Temperature channel
 External temperature sensor (NTC)
 Factory-calibrated internal temp. sensor: ±2°C
• LIN 2.1/SAE J2602-1 transceiver (ZSSC1750 only)
• Typical current consumption
 Normal Mode: 12mA
 Sleep Mode: ≤ 60µA
Benefits
• Integrated, precision measurement solution for
accurate prediction of battery state of health
(SOH), state of charge (SOC), or state of
function (SOF)
• Robust power-on-reset (POR) concept for harsh
automotive environments
• On-chip precision oscillator accuracy: ±1%
• On-chip low-power oscillator
• Only a few external components needed
• Easy communication via SPI interface
• Power supply, interrupt, and reset signals for
external microcontroller
• Watchdog timer with dedicated oscillator
• Industry’s smallest footprint allows minimal
module size and cost
• AEC-Q100 qualified solution
Available Support
• Evaluation Kit
• Application Notes
Physical Characteristics
• Operation temperature up to -40°C to +125°C
• Supply voltage: 4.2 to 18V
• Small footprint package: PQFN36 6x6 mm
* FSR = full-scale range.
Basic ZSSC1750/51 Application Circuit
+ - ^{To Harness}
Car Chassis Ground
Rshunt
+-
Battery
VBAT
VDDE
VDDP ^{3.3V, <30mA}
LIN-I/F
LIN
(ZSSC1750 )
INP
INN
VDDA
RX
TX
IRQN
MCU_RSTN
MCU_CLK
NTH
NTC ^ZSSC1750/51
NTL
SPI
VSSA VSSE
VDD
IRQ
Interface
RST
to Host
CLK (opt.) _{(e.g. CAN)}
I/F
µC
SPI
VSS
© 2016 Integrated Device Technology, Inc.
1
April 20, 2016