Rainbow-electronics MAX781 Manual de usuario descargar pdf (Pagina 11)

MAX781

PDA/Hand-Held Computer Power Controller

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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

Operating mode select bit, 0, see Table 2W4

VPPB voltage select bit 1, see Table 5W3

VPPB voltage select bit 0, see Table 5W2

VPPA voltage select bit 1, see Table 5W1

VPPA voltage select bit 0, see Table 5W0

1 = DCHG switching current source on, 0 = offW7

1 = Idle regulation, 0 = PWM regulationW6

Operating mode select bit, 1, see Table 2W5

CHG2

CHG1

CHG0

50N

FASTON

CHG6

CHG5

CHG4

CHG3

MUX0

MUX1

Charger current setting DAC bit 2W12

Charger current setting DAC bit 1W11

Charger current setting DAC bit 0W10

1 = 5OUT linear regulator on, 0 = offW9

1 = FAST sinks current, 0 = FAST open drainW8

Charger current setting DAC bit 6W16

Charger current setting DAC bit 5W15

Charger current setting DAC bit 4W14

Charger current setting DAC bit 3W13

Analog multiplexer bit 0W17

Analog multiplexer bit 1W18

GDSEL4

GDSEL3

GDSEL2

GDSEL1

MUX2

CHGINT

CHGSTAT

GDSEL5

3VSTAT

3VINT

BATTSTAT

BATTINT

NAME

1 = GD4 sources from VHI, 0 = GD4 sinks to AGNDW23

1 = GD3 sources from VHI, 0 = GD3 sinks to AGNDW22

1 = GD2 sources from VHI, 0 = GD2 sinks to AGNDW21

1 = GD1 sources from VHI, 0 = GD1 sinks to AGNDW20

Analog multiplexer bit 2W19

1 = VCHG > BATT detectedR/W27

1 = VCHG > BATT, 0 = VCHG < BATTR26

Unused25

1 = GD5 sources from VHI, 0 = GD5 sinks to AGNDW24

1 = 3OUT out of regulation, 0 = in regulationR28

1 = 3OUT fault detectedR/W29

BIT

1 = TEMP > 0.82*3OUT, 0 = TEMP < 0.82*3OUTR30

1 = TEMP pin voltage crossed 0.82* 3OUTR/W31

DESCRIPTIONR/W

* = Power-on reset default state

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 23 24

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Rainbow-electronics MAX781 Manual de usuario Pagina 11

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