Datasheet

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 Hour 1–12/0–23
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