ACE5372_11 Datasheet, PDF (8/31 Pages) ACE Technology Co., LTD. – Low Power Real-Time Clock (RTC)

ACE5372
Low Power Real-Time Clock (RTC)
For example, when 32.768KHz crystal is used. When (F6, F5, F4, F3, F2, F1, F0) are set to (0,1, 0, 1,
0, 0,1), counts will change as: 32768+（29-1）*2=32824 (clock will be delayed) when second digit is 00, 20,
or 40.When (F6, F5, F4, F3, F2, F1, F0) are set to (0, 0, 0, 0, 0, 0, 1), counts will remain 32,768 without
changing when second digit is 00, 20, or 40. When (F6, F5, F4, F3, F2, F1, F0) are set to (1,1,0,1,0,0,1),
counts will change as: 32768+（-17+1）*2=32736 (clock will be advanced) when second digit is 00, 20, or
40.
Adding 2 clock pulses every 20 seconds: 2/ （ 32768*20 ） =3.051ppm (or 3.125ppm when
32.000KHZcrystal is used), delays the clock by approx. 3ppm. Likewise, decrementing 2 clock pulses
advances the clock by 3ppm. Thus the clock may be adjusted to the precision of±1.5ppm. Note that the
time trimming function only adjusts clock timing and oscillation frequency but 32.768KHz clock output is
not adjusted.
5. Alarm Register (Alarm-A : internal address 8-AH; Alarm-B : internal address B-DH)
Alarm-A minute register (at internal address 8H)
D7
D6
D5
D4
D3
D2
D1
D0
Operation
- AM40
AM20
AM10
AM8
AM4
AM2
AM1
Write
0 AM40
AM20
AM10
AM8
AM4
AM2
AM1
Read
0 Undefined Undefined Undefined Undefined Undefined Undefined Undefined Default
Alarm-B minute register (at internal address BH)
D7
D6
D5
D4
D3
D2
D1
D0
Operation
- BM40
BM20
BM10
BM8
BM4
BM2
BM1
Write
0 BM40
BM10
BM10
BM8
BM4
BM2
BM1
Read
0 Undefined Undefined Undefined Undefined Undefined Undefined Undefined Default
Alarm-A hour register (at internal address 9H)
D7 D6
D5
D4
D3
D2
D1
D0
Operation
- - AH20,AP/A AH10
AH8
AH4
AH2
AH1
Write
0 - AH20,AP/A AH10
AH8
AH4
AH2
AH1
Read
0 0 Undefined Undefined Undefined Undefined Undefined Undefined Default
Alarm-B hour register (at internal address CH)
D7 D6
D5
D4
D3
D2
D1
D0
Operation
- - BH20,BP/A BH10
BH8
BH4
BH2
BH1
Write
0 0 BH20,BP/A BH10
BH8
BH4
BH2
BH1
Read
0 0 Undefined Undefined Undefined Undefined Undefined Undefined Default
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