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PCF2131 Datasheet(PDF) 29 Page - NXP Semiconductors

Part # PCF2131
Description  Nano-power highly accurate RTC with integrated quartz crystal
PDF  85 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2131 Datasheet(HTML) 29 Page - NXP Semiconductors

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NXP Semiconductors
PCF2131
Nano-power highly accurate RTC with integrated quartz crystal
Although the association of the weekdays counter to the actual weekday is arbitrary, the PCF2131 assumes that
Sunday is 000 and Monday is 001 for the purpose of determining the increment for calendar weeks.
Bit
Day[1]
2
1
0
Sunday
0
0
0
Monday
0
0
1
Tuesday
0
1
0
Wednesday
0
1
1
Thursday
1
0
0
Friday
1
0
1
Saturday
1
1
0
Table 39. Weekday assignments
[1]
Definition may be reassigned by the user.
7.9.7 Register Months
Bits labeled as T are unused and return 0 when read
Bit
7
6
5
4
3
2
1
0
Symbol
T
T
T
MONTHS (1 to 12)
Reset
value
0
0
0
0
0
0
0
1
Table 40. Months - months register (address 0Ch) bit allocation
Bits labeled as T are unused and return 0 when read
Bit
Symbol
Value
Place value Description
7 to 5
T
000
-
unused
4
0 to 1
ten’s place
3 to 0
MONTHS
0 to 9
unit place
actual month coded in BCD format, see Table 42
Table 41. Months - months register (address 0Ch) bit description
Upper-digit (ten’s
place)
Digit (unit place)
Month
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
January
0
0
0
0
1
February
0
0
0
1
0
March
0
0
0
1
1
April
0
0
1
0
0
May
0
0
1
0
1
Table 42. Month assignments in BCD format
PCF2131
All information provided in this document is subject to legal disclaimers.
© 2023 NXP B.V. All rights reserved.
Product data sheet
Rev. 2.0 — 5 October 2023
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