LP3947 Datasheet, PDF (12/14 Pages) National Semiconductor (TI) – USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

Application Notes (Continued)
TABLE 3. LP3947 Serial Port Communication address code 7h’47
LP3947 Control and Data Codes
Addrs
Register
765
4
3
2
1
0
8'h00
Charger
Batt Voltage AC Adaptor AC Adaptor AC Adaptor AC Adaptor
Register -1
(0) = 4.1V
Charge
Charge
Charge
Charge
1 = 4.2V
Current
Current
Current
Current
Code 3
Code 2
Code 1
Code 0
(1)
(0)
(0)
(0)
8'h01
Charger
EOC
Charging
EOC
EOC
Register -2
(Green LED) (Red LED)
SEL-1
SEL-0
R/O
R/O
(0)
(1)
8'h02
Charger
USB
USB
USB
USB
Register -3
Charge
Charge
Charge
Charge
Current
Current
Current
Current
Code 3
Code 2
Code 1
Code 0
(1)
(0)
(0)
(0)
Numbers in parentheses indicate default setting. “0” bit is set to low state, and “1” bit is set to high state. R/O –Read Only, All other bits are Read and Write.
TABLE 4. Charger Current and EOC Current Programming Code
Data Code
4h'00
4h'01
4h'02
4h'03
4h'04
4h'05
4h'06
4h'07
4h'08
4h'09
4h'0A
4h'0B
4h'0C
4h'0D
Charger Current
Selection Code I_SET (mA)
100
150
200
250
300
350
400
450
500
550
600
650
700
750
End of Charge Current
Selection Code
0.1C
0.15C
0.2C
w = write (sda = “0”)
r = read (sda = “1”)
ack = acknowledge (sda pulled low by either master or slave)
Nack = No Acknowledge
rs = repeated start
FIGURE 7. LP3947 (Slave) Register Write
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