PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 14

• Manufacturer Part Number: PCA2129T/Q900/2,51
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCA2129r

Specifications of PCA2129T/Q900/2,51

• Rohs: yes
• Function: Clock, Calendar, Alarm, Watchdog, Timestamp
• Rtc Bus Interface: I2C, SPI
• Date Format: Binary
• Time Format: Binary
• Supply Voltage - Max: 4.2 V
• Supply Voltage - Min: 1.8 V
• Maximum Operating Temperature: + 80 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Battery Backup Switching: Yes

NXP Semiconductors
2.
PCA2129T
Product data sheet
For further information, refer to the application note
8.4.1 Crystal aging correction
8.4 Register Aging_offset
Table 12.
The PCA2129T has an offset register Aging_offset to correct the crystal aging effects
The accuracy of the frequency of a quartz crystal depends on its aging. The aging offset
adds an adjustment, positive or negative, in the temperature compensation circuit which
allows correcting the aging effect.
At 25 C, the aging offset bits allow a frequency correction of typically 1 ppm per AO[3:0]
value, from 7 ppm to +8 ppm.
Table 13.
[1]
Bit
7 to 4 -
3 to 0 AO[3:0]
AO[3:0]
Decimal
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Default value.
Symbol
Aging_offset - crystal aging offset register (address 19h) bit description
Frequency correction at 25C, typical
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 January 2013
Ref. 3
Accurate RTC with integrated quartz crystal for automotive
“AN11120”.
Value
-
see
Table 13
Binary
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Description
unused
aging offset value
[1]
PCA2129T
ppm
+8
+7
+6
+5
+4
+3
+2
+1
0
1
2
3
4
5
6
7
© NXP B.V. 2013. All rights reserved.
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