Datasheet

DS1302 Trickle-Charge Timekeeping Chip
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
85h 84h
12/24
0
10
Hour Hour 1–12/0–23
AM/PM
87h
86h
0
0
10 Date
Date
1–31
89h 88h 0 0 0
10
Month
Month 1–12
8Bh
8Ah
0
0
0
0
0
Day
1–7
8Dh
8Ch
10 Year
Year
00–99
8Fh
8Eh
WP
0
0
0
0
0
0
0
—
91h
90h
TCS
TCS
TCS
TCS
DS
DS
RS
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
= TRICKLE CHARGER SELECT
DS
0-1
= DIODE SELECT
ROUT
0-1
= RESISTOR SELECT
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