
DS1302 Trickle-Charge Timekeeping Chip
9 of 13
Table 3. Register Address/Definition
RTC
READ WRITE BIT 7 BIT 6
BIT 5
BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
RANGE
81h
80h
CH
10 Seconds
Seconds
00–59
83h
82h
10 Minutes
Minutes
00–59
10
85h
84h
12/
24
0
AM/PM
Hour
1–12/0–23
87h
86h
0
10 Date
Date
1–31
89h
88h
0
10
Month
1–12
8Bh
8Ah
0
Day
1–7
8Dh
8Ch
10 Year
Year
00–99
8Fh
8Eh
WP
0
—
91h
90h
TCS
DS
RS
—
CLOCK BURST
BFh
BEh
RAM
C1h
C0h
00-FFh
C3h
C2h
00-FFh
C5h
C4h
00-FFh
.
FDh
FCh
00-FFh
RAM BURST
FFh
FEh
Figure 5. Programmable Trickle Charger
2K Ω
4k Ω
8k Ω
R1
R3
R2
V
CC2
V
CC1
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TCS3
TCS2
TCS1
TCS0
DS1
DS0
ROUT1
ROUT0
TRICKLE CHARGE REGISTER (90h write, 91h read)
1 0F 16 SELECT
NOTE: ONLY 1010b ENABLES CHARGER
1 OF 2
SELECT
1 OF 3
SELECT
TCS
0-3 = TRIC KLE C H AR G E R SELEC T
DS
0-1 = D IOD E SELEC T
ROUT
0-1 = RESISTO R SELE C T