TIDT247 February 2022
Table 2-1 describes the pin functions of the individual connectors.
| Connector | Pin | Description |
|---|---|---|
| J2 | 1 | GND |
| 2 | I²C – SCL | |
| 3 | I²C – SDA | |
| 4 | Vpu – 3.3-V pullup voltage for open drain IOs and I²C interface | |
| J4 | 1 | 10-kΩ resistor – connect to pin 2 if no external NTC is used |
| 2 | BQ25171-Q1 NTC connection | |
| 3 | GND | |
| J6 | 1 | 10-kΩ resistor – connect to pin 2 if no external NTC is used |
| 2 | BQ25171-Q1 NTC connection | |
| 3 | GND | |
| J5 | 2 | BQ25171-Q1 Charge Enable. 10-k pulldown – pull high to disable charger |
| 4 | BQ34210-Q1 Alert output. 10-k pullup to Vpu | |
| 6 | Learning load EN. FET input. 10-k pulldown – pullup to enable learning load | |
| 8 | BQ25171-Q1 STAT2 output. 22-k pullup to Vpu | |
| 10 | BQ25171-Q1 STAT1 output. 22-k pullup to Vpu | |
| 12 | LM5152-Q1 enable. Pull high to enable boost converter | |
| 14 | LM5152-Q1 status output. 22k pullup to Vpu | |
| 18 | LM74800-Q1 enable input. Pull high to connect main power input to boost converter | |
| 20 | Backup battery enable. 4.7-k pullup to Vpu. Pull low for normal operation, pull high or leave open with applied pullup voltage for backup battery operation | |
| All others | No connection | |
| J7 | All uneven | GND |
| 20 | Connect to GND to disable charge timer | |
| 22 | Connect to GND to set charge timer to 10 h | |
| 24 | Connect to GND to set charge timer to 5 h | |
| 2 | Connect to GND to set charging voltage to 3.5 V | |
| 4 | Connect to GND to set charging voltage to 3.6 V | |
| 6 | Connect to GND to set charging voltage to 3.7 V | |
| 8 | Connect to GND to set charging voltage to 3.8 V | |
| 10 | Connect to GND to set charging voltage to 3.9 V | |
| 12 | Connect to GND to set charging voltage to 4.05 V | |
| 14 | Connect to GND to set charging voltage to 4.1 V | |
| 16 | Connect to GND to set charging voltage to 4.2 V | |
| 18 | Connect to GND to set charging voltage to 4.35 V | |
| J12 | 1 | LM5152-Q1 internal VCC. For frequency response analysis, connect 5.5 V to this pin and pin 2 and populate R37 with 49.9 Ω. For normal operation, remove external voltage source and populate R37 with 0 Ω. |
| 2 | LM5152-Q1 MODE pin. Connect to pin 1 for FPWM operation, to pin 3 for Diode Emulation or leave open for skip mode | |
| 3 | LM5152-Q1 AGND | |
| J15 | 1 | GND |
| 2 | Voltage sense output of resistive voltage divider. Divider can be disconnected by LM74800-Q1 to avoid leakage current. |