Rainbow Electronics MAX769 - Manual (Page 12)

MAX769
2 or 3-Cell, Step-Up/Down,
Two-Way Pager System IC
12 ______________________________________________________________________________________
Table 1. Serial-Bit Assignments
Table 2. Serial-Bit Power-On Reset (POR) States
Table 3. Input-Bit Function Description
Table 4. Serial Output Data
R2 (MSB) R0 D3 D1
0 0 DR1_ON REG2_ON
0 1
LBO_Sets_
BACKUP
15mA_CHG
0 0 OV3 OV1
0 1 X X
R1
0
0
1
1
D4
DR2_ON
X
OV4
X
D2 D0
RUN/
COAST
1mA_CHG
OV0
X
REG3_ON
BACKUP
OV2
X
1 DAC5 DAC3 DAC1 DAC6 DAC4 DAC0 DAC2
R2 R0 D3 D1
0 0 POR = 0 POR = 0
0 1 POR = 0 POR = 0
0 0 POR = 1 POR = 0
0 1 X X
R1
0
0
1
1
D4
POR = 0
X
POR = 0
X
D2 D0
POR = 0
POR = 0
POR = 0
X
POR = 0
POR = 0
POR = 1
X
1 POR = 0 POR = 0 POR = 0 POR = 0 POR = 0 POR = 0 POR = 0
Sets 7-bit CH DAC voltage for A/D conversion (POR state is all zeros with DAC and comparators off). DAC0–DAC6
Sets OUT Output Voltage (POR state is V OUT = 3.0V). OV0–OV4
1 = Allows LBO to turn on the backup regulator and disable the DC-DC converter (POR state is no
connection between LBO and BACKUP).
LBO_Sets_BACKUP
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).
BACKUP
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 selected switch (POR state is off).
1 = Turns on the selected regulator (POR state is off).
1 = Run Mode, 0 = Coast Mode (POR state is Coast Mode).
FUNCTION
1mA_CHG, 15mA_CHG
DR1, DR2
REG2_ON, REG3_ON
RUN/COAST
INPUT BIT
D7 (MSB) D5 D3–D0
CH2_OUT CH0_OUT X
D6
CH1_OUT
D4
LBO
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.