LP3921 Datasheet, PDF (20/34 Pages) National Semiconductor (TI) – Battery Charger Management and Regulator Unit with Integrated Boomer® Audio Amplifier

stant current. This threshold can be set to 0.1C, 0.15C, 0.2C
or 0.25C by changing the contents of the PROG_EOC[1:0]
register bits.
TABLE 11. Register Address 8h'12: CHGCNTL3
BIT
NAME
FUNCTION
2 Prog_EOC[0] Set the End Of Charge Current.
3 Prog_EOC[1] ^{See Table 7.}
TERMINATION AND RESTART
The termination and restart voltage levels are determined by
the data in the VTERM[1:0] and PROG_VSTRT[1:0] bits in
the control register. The restart voltage is programmed rela-
tive to the selected termination voltage.
The Termination voltages available are 4.1V, 4.2V (default),
4.3V, and 4.4V.
The Restart voltages are determined relative to the termina-
tion voltage level and may be set to 50 mV, 100 mV, 150 mV
(default), and 200 mV below the set termination voltage level.
TABLE 12. Register Address 8h'12: CHGCNTL3
BIT
NAME
FUNCTION
4
VTERM[0] Set the charging termination
5
VTERM[1] ^voltage.
See Table 6.
0
VRSTR[0] Set the charging restart
1
VRSTR[1] ^{voltage. See Table 8.}
CHARGER FULL RATE CURRENT
Programming Information
TABLE 13. Register Address 8h'11: CHGCNTL2
Data BITs
HEX
NAME
FUNCTION
000[00000]
00
Prog_ICHG
50 mA
000[00001]
01
100 mA
000[00010]
02
150 mA
000[00011]
03
200 mA
000[00100]
04
250 mA
000[00101]
05
300 mA
000[00110]
06
350 mA
000[00111]
07
400 mA
000[01000]
08
450 mA
000[01001]
09
500 mA
000[01010]
0A
550 mA
000[01011]
0B
600 mA
000[01100]
0C
650 mA
000[01101]
0D
700 mA
000[01110]
0E
750 mA
000[01111]
0F
800 mA
000[10000]
10
850 mA
000[10001]
11
900 mA
000[10010]
12
950 mA
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