MAX781CBX 데이터 시트보기 (PDF) - Maxim Integrated
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MAX781CBX Datasheet PDF : 24 Pages
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PDA/Hand-Held Computer Power Controller
Table 3. Configuration Data-Bit Assignments
BIT
R/W
*
NAME
DESCRIPTION
31
R/W
0
BATTINT 1 = TEMP pin voltage crossed 0.82* 3OUT
30
R
0 BATTSTAT 1 = TEMP > 0.82*3OUT, 0 = TEMP < 0.82*3OUT
29
R/W
0
3VINT
1 = 3OUT fault detected
28
R
0
3VSTAT
1 = 3OUT out of regulation, 0 = in regulation
27
R/W
0
CHGINT 1 = VCHG > BATT detected
26
R
0 CHGSTAT 1 = VCHG > BATT, 0 = VCHG < BATT
25
Unused
24
W
0
GDSEL5 1 = GD5 sources from VHI, 0 = GD5 sinks to AGND
23
W
0
GDSEL4 1 = GD4 sources from VHI, 0 = GD4 sinks to AGND
22
W
0
GDSEL3 1 = GD3 sources from VHI, 0 = GD3 sinks to AGND
21
W
0
GDSEL2 1 = GD2 sources from VHI, 0 = GD2 sinks to AGND
20
W
1
GDSEL1 1 = GD1 sources from VHI, 0 = GD1 sinks to AGND
19
W
0
MUX2
Analog multiplexer bit 2
18
W
1
MUX1
Analog multiplexer bit 1
17
W
0
MUX0
Analog multiplexer bit 0
16
W
0
CHG6
Charger current setting DAC bit 6
15
W
0
CHG5
Charger current setting DAC bit 5
14
W
0
CHG4
Charger current setting DAC bit 4
13
W
0
CHG3
Charger current setting DAC bit 3
12
W
0
CHG2
Charger current setting DAC bit 2
11
W
1
CHG1
Charger current setting DAC bit 1
10
W
0
CHG0
Charger current setting DAC bit 0
9
W
1
50N
1 = 5OUT linear regulator on, 0 = off
8
W
0
FASTON 1 = FAST sinks current, 0 = FAST open drain
7
W
1
CHARGE 1 = DCHG switching current source on, 0 = off
6
W
1
IDLE
1 = Idle regulation, 0 = PWM regulation
5
W
1
MODE1
Operating mode select bit, 1, see Table 2
4
W
1
MODE0
Operating mode select bit, 0, see Table 2
3
W
0
VPPB1
VPPB voltage select bit 1, see Table 5
2
W
0
VPPB0
VPPB voltage select bit 0, see Table 5
1
W
0
VPPA1
VPPA voltage select bit 1, see Table 5
0
W
0
VPPA0
VPPA voltage select bit 0, see Table 5
* = Power-on reset default state
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.
______________________________________________________________________________________ 11
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