PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 13

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PCF2129AT/2,518

Manufacturer Part Number
PCF2129AT/2,518
Description
Real Time Clock
Manufacturer
NXP Semiconductors
Series
PCF2129r
Datasheet

Specifications of PCF2129AT/2,518

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
1.2 V
Maximum Operating Temperature
+ 60 C
Minimum Operating Temperature
- 15 C
Mounting Style
SMD/SMT
Package / Case
SOP-20
Battery Backup Switching
Yes
Factory Pack Quantity
2000

Available stocks

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Manufacturer
Quantity
Price
Part Number:
PCF2129AT/2,518
Manufacturer:
NXP
Quantity:
100
Part Number:
PCF2129AT/2,518
Manufacturer:
NXP
Quantity:
30
Part Number:
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Manufacturer:
NXP
Quantity:
250
Part Number:
PCF2129AT/2,518
Manufacturer:
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Quantity:
20 000
NXP Semiconductors
2.
PCF2129AT
Product data sheet
For further information please refer to the application note
8.4.1 Crystal aging correction
8.4 Register Aging_offset
Table 12.
The PCF2129AT 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. 5 — 12 February 2013
Ref. 3
Value
-
see
Table 13
“AN10857”.
Binary
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Description
unused
aging offset value
Integrated RTC, TCXO and quartz crystal
[1]
PCF2129AT
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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