SLUSFR7 August 2025 BQ24810
PRODUCTION DATA
請(qǐng)參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
The BQ24810 device monitors the power used by the system by adding the power discharged from the battery to the power pulled from the adapter. The PMON pin is a current source with output current proportional to system power. The PMON output current is calculated in Equation 1. APMON is the ratio of PMON pin output current to system power. It can be set in REG0x3B[9] with default 1 μA/W (REG0x3B[9] = 1) for 10-mΩ RAC and RSR sense resistors. This gain scales with the value of the sense resistors used so that 20-mΩ RAC and RSR instead have a gain of 2 μA/W with the same setting (REG0x3B[9] = 1).
The BQ24810 device allows an input sense resistor that is 2x or 1/2x of charge sense resistor by setting REG0x3B[13:12] to 01 or 10, respectively. With REG0x3B[13:12] set to 01, the current measurement across RSR is internally doubled so that a 20-mΩ RAC and 10-mΩ RSR will have the same output at the PMON pin as a 20-mΩ RAC and 20-mΩ RSR will have with REG0x3B[13:12] set to 00. With REG0x3B[13:12] set to 10, the current measurement across RAC is doubled instead. APMON as a function of RAC, RSR, REG0x3B[9] and REG0x3B[13:12] is summarized in Table 6-1. The REG0x3B[13:12] sense ratio must be set as shown in the table for each RAC and RSR combination. The REG0x3B[9] PMON gain may be set to either 0 or 1. The resultant APMON for each setting is shown.
| RAC | RSR | REG0x3B[13:12] RAC and RSR Ratio | REG0x3B[9] PMON Gain | APMON |
|---|---|---|---|---|
| 2.5 mΩ | 5 mΩ | 10 = RAC and RSR 1:2 | 0 = 0.25 μA/W for 10 mΩ | 0.125 μA/W |
| 2.5 mΩ | 5 mΩ | 10 = RAC and RSR 1:2 | 1 = 1 μA/W for 10 mΩ | 0.5 μA/W |
| 5 mΩ | 5 mΩ | 00 = RAC and RSR 1:1 | 0 = 0.25 μA/W for 10 mΩ | 0.125 μA/W |
| 5 mΩ | 5 mΩ | 00 = RAC and RSR 1:1 | 1 = 1 μA/W for 10 mΩ | 0.5 μA/W |
| 10 mΩ | 5 mΩ | 01 = RAC and RSR 2:1 | 0 = 0.25 μA/W for 10 mΩ | 0.25 μA/W |
| 10 mΩ | 5 mΩ | 01 = RAC and RSR 2:1 | 1 = 1 μA/W for 10 mΩ | 1 μA/W |
| 5 mΩ | 10 mΩ | 10 = RAC and RSR 1:2 | 0 = 0.25 μA/W for 10 mΩ | 0.25 μA/W |
| 5 mΩ | 10 mΩ | 10 = RAC and RSR 1:2 | 1 = 1 μA/W for 10 mΩ | 1 μA/W |
| 10 mΩ | 10 mΩ | 00 = RAC and RSR 1:1 | 0 = 0.25 μA/W for 10 mΩ | 0.25 μA/W |
| 10 mΩ | 10 mΩ | 00 = RAC and RSR 1:1 | 1 = 1 μA/W for 10 mΩ | 1 μA/W |
| 20 mΩ | 10 mΩ | 01 = RAC and RSR 2:1 | 0 = 0.25 μA/W for 10 mΩ | 0.5 μA/W |
| 20 mΩ | 10 mΩ | 01 = RAC and RSR 2:1 | 1 = 1 μA/W for 10 mΩ | 2 μA/W |
| 10 mΩ | 20 mΩ | 10 = RAC and RSR 1:2 | 0 = 0.25 μA/W for 10 mΩ | 0.5 μA/W |
| 10 mΩ | 20 mΩ | 10 = RAC and RSR 1:2 | 1 = 1 μA/W for 10 mΩ | 2 μA/W |
| 20 mΩ | 20 mΩ | 00 = RAC and RSR 1:1 | 0 = 0.25 μA/W for 10 mΩ | 0.5 μA/W |
| 20 mΩ | 20 mΩ | 00 = RAC and RSR 1:1 | 1 = 1 μA/W for 10 mΩ | 2 μA/W |
A resistor is connected on the PMON pin to convert output current to output voltage with desired scaling. A maximum 100-pF capacitor to GND is recommended as close as possible to the PMON pin for decoupling high-frequency noise. An additional RC filter is optional, if additional filtering is desired. Note that adding filtering also adds additional response delay. The PMON output voltage is clamped to 3.3 V.