DS1302 Datasheet, PDF (9/13 Pages) Dallas Semiconductor – Trickle Charge Timekeeping Chip

DS1302 Trickle-Charge Timekeeping Chip
Table 3. Register Address/Definition
RTC
READ
81h
83h
85h
87h
89h
8Bh
8Dh
8Fh
91h
WRITE
80h
82h
84h
86h
88h
8Ah
8Ch
8Eh
90h
BIT 7
CH
12/24
0
0
0
WP
TCS
BIT 6 BIT 5 BIT 4
10 Seconds
10 Minutes
0
10
AM/PM
Hour
0
10 Date
0
0
10
Month
0
0
0
10 Year
0
0
0
TCS TCS TCS
BIT 3
0
0
DS
BIT 2 BIT 1
Seconds
Minutes
Hour
Date
Month
Day
Year
0
0
DS RS
BIT 0
0
RS
RANGE
00–59
00–59
1–12/0–23
1–31
1–12
1–7
00–99
—
—
CLOCK BURST
BFh
BEh
RAM
C1h C0h
C3h C2h
C5h C4h
.
.
.
.
.
.
FDh FCh
00-FFh
00-FFh
00-FFh
.
.
.
00-FFh
RAM BURST
FFh FEh
Figure 5. Programmable Trickle Charger
TRICKLE CHARGE REGISTER (90h write, 91h read)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
TCS3 TCS2 TCS1 TCS0 DS1
DS0
Bit 1
Bit 0
ROUT1 ROUT0
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
V_CC2
R1
2K Ω
R2
4k Ω
R3
8k Ω
V_CC1
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