MAX769 Просмотр технического описания (PDF) - Maxim Integrated
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MAX769 Datasheet PDF : 16 Pages
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2 or 3-Cell, Step-Up/Down,
Two-Way Pager System IC
Table 1. Serial-Bit Assignments
R2 (MSB)
R1
R0
0
0
0
D4
DR2_ON
0
0
1
X
0
1
0
OV4
0
1
1
X
1
DAC6
DAC5
DAC4
D3
DR1_ON
LBO_Sets_
BACKUP
OV3
X
DAC3
D2
REG3_ON
BACKUP
OV2
X
DAC2
D1
REG2_ON
15mA_CHG
OV1
X
DAC1
D0
RUN/
COAST
1mA_CHG
OV0
X
DAC0
Table 2. Serial-Bit Power-On Reset (POR) States
R2
R1
R0
D4
D3
0
0
0
POR = 0
POR = 0
0
0
1
X
POR = 0
0
1
0
POR = 0
POR = 1
0
1
1
X
X
1
POR = 0
POR = 0
POR = 0
POR = 0
D2
POR = 0
POR = 0
POR = 1
X
POR = 0
D1
POR = 0
POR = 0
POR = 0
X
POR = 0
D0
POR = 0
POR = 0
POR = 0
X
POR = 0
Table 3. Input-Bit Function Description
INPUT BIT
RUN/COAST
REG2_ON, REG3_ON
DR1, DR2
1mA_CHG, 15mA_CHG
BACKUP
LBO_Sets_BACKUP
OV0–OV4
DAC0–DAC6
FUNCTION
1 = Run Mode, 0 = Coast Mode (POR state is Coast Mode).
1 = Turns on the selected regulator (POR state is off).
1 = Turns on the selected switch (POR state is off).
1 = Turns on the selected charge current to NICD. If both are set, the charge current is 15mA (POR
state is off).
1 = Turns on the backup linear regulator from NICD to OUT and disables the DC-DC converter (POR
state is BACKUP off). Setting this bit overrides 1mA_CHG, 15mA_CHG, and LBO_Sets_BACKUP
(Figure 1).
1 = Allows LBO to turn on the backup regulator and disable the DC-DC converter (POR state is no
connection between LBO and BACKUP).
Sets OUT Output Voltage (POR state is VOUT = 3.0V).
Sets 7-bit CH DAC voltage for A/D conversion (POR state is all zeros with DAC and comparators off).
Table 4. Serial Output Data
D7 (MSB)
D6
D5
D4
CH2_OUT
CH1_OUT
CH0_OUT
LBO
D3–D0
X
FUNCTION
CH_OUT and LBO output bits. A 1 indicates
that the selected channel (CH_) voltage is
greater than the CH DAC voltage or that LBI is
less than 0.6V.
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