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MAX781EBX Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX781EBX Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 24 page PDA/Hand-Held Computer Power Controller ______________________________________________________________________________________ 11 nal, causing the battery pack to need at least three ter- minals: BATT+, BATT,- and THERM. The MAX781’s TEMP pin connects to the battery pack’s thermistor (Figure 6). Without the battery pack installed, R8 pulls the MAX781’s TEMP pin up to 3OUT, and BATTSTAT = 1. When the battery pack is inserted, the resistive divider formed by the thermistor and R8 pulls the TEMP pin below 3OUT, forcing BATTSTAT = 0. Any transition of BATTSTAT sets BATTINT. Clear BATTINT by writting a logic 1 in bit 31 of the serial-configuration data. The BATTSTAT comparator is disabled in low-power and shutdown modes, and outputs a logic zero regardless of the state of its inputs. 3VINT and 3VSTAT indicate the status of the 3OUT output (+3.3V ±4%). 3OUT is out of regulation when its output voltage falls below +3.1V. 3VSTAT = 0 when 3OUT is in regulation, and 3VSTAT = 1 when 3OUT is out of regulation. A rising edge on 3VSTAT sets 3VINT; thus, 3OUT going out of regulation sets 3VINT. Table 3. Configuration Data-Bit Assignments MODE0 VPPB1 VPPB0 VPPA1 VPPA0 CHARGE IDLE MODE1 1 0 0 0 0 1 1 1 Operating mode select bit, 0, see Table 2 W 4 VPPB voltage select bit 1, see Table 5 W 3 VPPB voltage select bit 0, see Table 5 W 2 VPPA voltage select bit 1, see Table 5 W 1 VPPA voltage select bit 0, see Table 5 W 0 1 = DCHG switching current source on, 0 = off W 7 1 = Idle regulation, 0 = PWM regulation W 6 Operating mode select bit, 1, see Table 2 W 5 CHG2 CHG1 CHG0 50N FASTON CHG6 CHG5 CHG4 CHG3 MUX0 MUX1 0 1 0 1 0 0 0 0 0 0 1 Charger current setting DAC bit 2 W 12 Charger current setting DAC bit 1 W 11 Charger current setting DAC bit 0 W 10 1 = 5OUT linear regulator on, 0 = off W 9 1 = FAST sinks current, 0 = FAST open drain W 8 Charger current setting DAC bit 6 W 16 Charger current setting DAC bit 5 W 15 Charger current setting DAC bit 4 W 14 Charger current setting DAC bit 3 W 13 Analog multiplexer bit 0 W 17 Analog multiplexer bit 1 W 18 GDSEL4 GDSEL3 GDSEL2 GDSEL1 MUX2 CHGINT CHGSTAT GDSEL5 3VSTAT 3VINT BATTSTAT BATTINT NAME 0 0 0 1 0 0 0 0 0 0 0 0 * 1 = GD4 sources from VHI, 0 = GD4 sinks to AGND W 23 1 = GD3 sources from VHI, 0 = GD3 sinks to AGND W 22 1 = GD2 sources from VHI, 0 = GD2 sinks to AGND W 21 1 = GD1 sources from VHI, 0 = GD1 sinks to AGND W 20 Analog multiplexer bit 2 W 19 1 = VCHG > BATT detected R/W 27 1 = VCHG > BATT, 0 = VCHG < BATT R 26 Unused 25 1 = GD5 sources from VHI, 0 = GD5 sinks to AGND W 24 1 = 3OUT out of regulation, 0 = in regulation R 28 1 = 3OUT fault detected R/W 29 BIT 1 = TEMP > 0.82*3OUT, 0 = TEMP < 0.82*3OUT R 30 1 = TEMP pin voltage crossed 0.82* 3OUT R/W 31 DESCRIPTION R/W * = Power-on reset default state |
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