ZHCSEX1A March 2016 – April 2016
PRODUCTION DATA.
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NUMBER | ||
| BAT | C3 | PI, AI(1) | LDO regulator input and battery voltage measurement input. Kelvin sense connect to the positive battery terminal (PACKP). Connect a capacitor (1 µF) between BAT and VSS. Place the capacitor close to the gauge. |
| BIN | B1 | DI | Battery insertion detection input. If OpConfig [BI_PU_EN] = 1 (default), a logic low on the pin is detected as battery insertion. For a removable pack, the BIN pin can be connected to VSS through a pulldown resistor on the pack, typically the 10-kΩ thermistor; the system board should use a 1.8-MΩ pullup resistor to VDD to ensure the BIN pin is high when a battery is removed. If the battery is embedded in the system or in the pack, it is recommended to leave [BI_PU_EN] = 1 and use a 10-kΩ pulldown resistor from BIN to VSS. If [BI_PU_EN] = 0, then the host must inform the gauge of battery insertion and removal with the BAT_INSERT and BAT_REMOVE subcommands. A 10-kΩ pulldown resistor should be placed between BIN and VSS, even if this pin is unused. NOTE: The BIN pin must not be shorted directly to VCC or VSS and any pullup resistor on the BIN pin must be connected only to VDD and not an external voltage rail. If an external thermistor is used for temperature input, the thermistor should be connected between this pin and VSS. |
| GPOUT | A1 | DO | This open-drain output can be configured to indicate BAT_LOW when the OpConfig [BATLOWEN] bit is set. By default [BATLOWEN] is cleared and this pin performs an interrupt function (SOC_INT) by pulsing for specific events, such as a change in state-of-charge. Signal polarity for these functions is controlled by the [GPIOPOL] configuration bit. This pin should not be left floating, even if unused; therefore, a 10-kΩ pullup resistor is recommended. If the device is in SHUTDOWN mode, toggling GPOUT makes the gauge exit SHUTDOWN. It is recommended to connect GPOUT to a GPIO of the host MCU so that in case of any inadvertent shutdown condition, the gauge can be commanded to come out of SHUTDOWN. |
| SCL | A3 | DIO | Slave I2C serial bus for communication with system (Master). Open-drain pins. Use with external 10-kΩ pullup resistors (typical) for each pin. If the external pullup resistors will be disconnected from these pins during normal operation, recommend using external 1-MΩ pulldown resistors to VSS at each pin to avoid floating inputs. |
| SDA | A2 | DIO | |
| SRN | C2 | AI | Coulomb counter differential inputs expecting an external 10-mΩ, 1% sense resistor. For system-side configurations, Kelvin sense connect SRP to the positive battery terminal (PACKP) side of the external sense resistor. Kelvin sense connect SRN to the other side of the external sense resistor with the positive connection to the system (VSYS). For pack-side configurations with low-side sensing, connect SRP to PACK– and SRN to Cell–. See the Simplified Schematic. No calibration is required. The fuel gauge is pre-calibrated for a standard 10-mΩ, 1% sense resistor. |
| SRP | C1 | AI | |
| VDD | B3 | PO | 1.8-V regulator output. Decouple with a 2.2-μF ceramic capacitor to VSS. This pin is not intended to provide power for other devices in the system. |
| VSS | B2 | PI | Ground pin |