MAX1645 Datasheet, PDF (15/32 Pages) Maxim Integrated Products – Advanced Chemistry-Independent, Level 2 Battery Chargers with Input Current Limiting

Advanced Chemistry-Independent, Level 2
Battery Chargers with Input Current Limiting
ever BATTERY_PRESENT = 0 or ChargerMode() is writ-
ten with POR_RESET = 1. The ALARM_INHIBITED sta-
tus bit can also be cleared by writing a new charging
current OR charging voltage.
a) Write-Word Format
S
SLAVE
ADDRESS
W
ACK
COMMAND
BYTE
ACK
LOW
DATA
BYTE
ACK
HIGH
DATA
BYTE
ACK P
7 bits 1b 1b
MSB LSB 0 0
8 bits
MSB LSB
1b
8 bits
1b
8 bits
1b
0 MSB LSB 0 MSB LSB 0
Preset to
0b0001001
ChargerMode() = 0x12
ChargingCurrent() = 0x14
ChargerVoltage() = 0x15
AlarmWarning() = 0x16
D7
D0
D15 D8
b) Read-Word Format
S
SLAVE
ADDRESS
W
ACK
COMMAND
BYTE
ACK
S
SLAVE
ADDRESS
R
ACK
LOW
DATA
BYTE
ACK
HIGH
DATA
BYTE
NACK P
7 bits 1b 1b
8 bits
1b
MSB LSB 0 0
MSB LSB
0
Preset to
0b0001001
ChargerSpecInfo() =
0x11
ChargerStatus() =
0x13
7 bits 1b 1b
MSB LSB 1 0
Preset to
0b0001001
8 bits
1b
MSB LSB 0
D7
D0
8 bits
1b
MSB LSB 1
D15 D8
Legend:
S = Start Condition or Repeated Start Condition
ACK = Acknowledge (logic low)
W = Write Bit (logic low)
P = Stop Condition
NACK = NOT Acknowledge (logic high)
R = Read Bit (logic high)
MASTER TO SLAVE
SLAVE TO MASTER
Figure 3. SMBus a) Write-Word and b) Read-Word Protocols
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