The ADS131B23 is a fully integrated, high-voltage, battery-pack monitor for industrial battery management systems (BMS).
The ADS131B23 integrates two simultaneous-sampling, high-precision, 24-bit ADC channels (ADC1A, ADC1B) to redundantly measure battery current with high resolution and accuracy using an external shunt resistor. Two independent digital comparators enable fast overcurrent detection in parallel with the two ADCs.
An additional multiplexed, 16-bit ADC (ADC2A) is available to measure shunt temperature and other voltages in the system, such as battery-pack voltage, using external high-voltage resistor dividers. Shunt temperature is measured using an external temperature sensor, such as a thermistor or an analog output temperature sensor. ADC2A is equipped with a channel sequencer that automatically steps through the configured multiplexer inputs to reduce communication on the SPI.
The device integrates many monitoring and diagnostic features to mitigate and detect random hardware faults to aid in the development of functionally safe BMS.
Internal linear regulators with input ranges up to 16V support powering the device with unregulated DC/DC converters.
The ADS131B23 is offered in a 48-pin HTQFP package and is specified over the automotive temperature range of –40°C to +105°C.
PIN | TYPE | DESCRIPTION(1) | |
---|---|---|---|
NAME | NO. | ||
AGND | 39 | Analog supply | Analog ground. |
AGND | 21 | Analog supply | Analog ground. |
AGNDA | 42 | Analog supply | Section A analog ground. Connect to AGND. |
AGNDB | 19 | Analog supply | Section B analog ground. Connect to AGND. |
APWR | 38 | Analog supply | Analog power supply. Connect a 1-μF capacitor to AGND. |
AVDD | 40 | Analog supply | Analog supply. Connect a 1-μF capacitor to AGND. Sets the logic levels for GPIO0A, GPIO1A, GPIO0B, and GPIO1B. |
CLK | 32 | Digital I/O | Main clock input.(4) |
CNA | 6 | Analog input | ADC1A negative analog input. |
CNB | 9 | Analog input | ADC1B negative analog input. |
CPA | 5 | Analog input | ADC1A positive analog input. |
CPB | 10 | Analog input | ADC1B positive analog input. |
CSn | 31 | Digital input | Chip-select input; active low. Internal pullup resistor to IOVDD.(4) |
DCAP | 36 | Digital supply | DVDD LDO output. Connect a 220-nF capacitor to DGND. |
DGND | 35 | Digital supply | Digital ground. |
DPWR | 37 | Digital supply | Digital power supply. Connect a 1-μF capacitor to DGND. |
DRDYn | 27 | Digital output | Data-ready output; active low.(2)(4) |
GPIO0A | 3 | Digital I/O | General-purpose digital input/output 0A.(2)(3) |
GPIO0B | 8 | Digital I/O | General-purpose digital input/output 0B.(2)(3) |
GPIO0/MHD | 33 | Digital I/O | General-purpose digital input/output 0.(2)(4) Missing host detect output.(2)(4) |
GPIO1 | 26 | Digital I/O | General-purpose digital input/output 1.(2)(4) |
GPIO1A | 4 | Digital I/O | General-purpose digital input/output 1A.(2)(3) |
GPIO1B | 7 | Digital I/O | General-purpose digital input/output 1B.(2)(3) |
GPIO2/FAULT | 25 | Digital I/O | General-purpose digital input/output 2.(2)(4) Fault output.(2)(4) |
GPIO3/OCCA | 24 | Digital I/O | General-purpose digital input/output 3.(2)(4) Overcurrent comparator A output.(2)(4) |
GPIO4/OCCB | 22 | Digital I/O | General-purpose digital input/output 4.(2)(4) Overcurrent comparator B output.(2)(4) |
IOVDD | 34 | Digital supply | Digital I/O supply. Connect a 1-μF capacitor to DGND. Sets the logic levels for the digital I/Os, except for GPIO0A, GPIO1A, GPIO0B, and GPIO1B. |
NC | 11 to 18 | NC | No connect. Leave these pins floating or connected to AGNDB. |
RCAPA | 41 | Analog output | REFA voltage reference output. Connect a 1-μF capacitor to AGNDA. |
RCAPB | 20 | Analog output | REFB voltage reference output. Connect a 1-μF capacitor to AGNDB. |
RESETn | 23 | Digital input | Reset input; active low. Internal pulldown resistor to DGND. |
SCLK | 28 | Digital input | Serial data clock input.(4) |
SDI | 30 | Digital input | Serial data input.(4) |
SDO | 29 | Digital output | Serial data output.(2)(4) |
V0A | 2 | Analog input | ADC2A analog input 0A. |
V1A | 1 | Analog input | ADC2A analog input 1A. |
V2A | 48 | Analog input | ADC2A analog input 2A. |
V3A | 47 | Analog input | ADC2A analog input 3A. |
V4A | 46 | Analog input | ADC2A analog input 4A. |
V5A | 45 | Analog input | ADC2A analog input 5A. |
V6A | 44 | Analog input | ADC2A analog input 6A. |
V7A | 43 | Analog input | ADC2A analog input 7A. |
Thermal Pad | Pad | — | Thermal power pad. Connect to AGND. |