PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 71
![no-image](/images/manufacturer_photos/0/4/487/nxp_semiconductors_sml.jpg)
PCA2129T/Q900/2,51
Manufacturer Part Number
PCA2129T/Q900/2,51
Description
Real Time Clock
Manufacturer
NXP Semiconductors
Series
PCA2129r
Datasheet
1.PCA2129TQ900251.pdf
(72 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
PCA2129T/Q900/2,51
Manufacturer:
NXP/恩智浦
Quantity:
20 000
NXP Semiconductors
26. Contents
1
2
3
4
4.1
5
6
7
7.1
7.2
8
8.1
8.2
8.2.1
8.2.2
8.2.3
8.3
8.3.1
8.3.1.1
8.3.2
8.4
8.4.1
8.5
8.5.1
8.5.1.1
8.5.1.2
8.5.1.3
8.5.1.4
8.5.2
8.5.3
8.6
8.7
8.7.1
8.7.2
8.8
8.8.1
8.8.2
8.8.3
8.8.4
8.8.5
8.8.6
8.8.7
8.8.8
8.9
8.9.1
PCA2129T
Product data sheet
General description . . . . . . . . . . . . . . . . . . . . . . 1
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering information . . . . . . . . . . . . . . . . . . . . . 2
Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pinning information . . . . . . . . . . . . . . . . . . . . . . 4
Functional description . . . . . . . . . . . . . . . . . . . 5
Temperature compensated crystal oscillator . 12
Temperature measurement . . . . . . . . . . . . . . 12
Battery switch-over function . . . . . . . . . . . . . . 15
Battery switch-over disabled: only one power
Register Seconds . . . . . . . . . . . . . . . . . . . . . . 23
Setting and reading the time. . . . . . . . . . . . . . 25
Register Second_alarm . . . . . . . . . . . . . . . . . 27
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 2
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4
Register overview . . . . . . . . . . . . . . . . . . . . . . . 5
Control registers . . . . . . . . . . . . . . . . . . . . . . . . 9
Register Control_1 . . . . . . . . . . . . . . . . . . . . . . 9
Register Control_2 . . . . . . . . . . . . . . . . . . . . . 10
Register Control_3 . . . . . . . . . . . . . . . . . . . . . 11
Register CLKOUT_ctl . . . . . . . . . . . . . . . . . . . 12
Clock output . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Register Aging_offset . . . . . . . . . . . . . . . . . . . 14
Crystal aging correction . . . . . . . . . . . . . . . . . 14
Power management functions . . . . . . . . . . . . 15
Standard mode . . . . . . . . . . . . . . . . . . . . . . . . 16
Direct switching mode . . . . . . . . . . . . . . . . . . 16
supply (V
Battery switch-over architecture . . . . . . . . . . . 17
Battery backup supply . . . . . . . . . . . . . . . . . . 18
Battery low detection function. . . . . . . . . . . . . 19
Oscillator stop detection function . . . . . . . . . . 20
Reset function . . . . . . . . . . . . . . . . . . . . . . . . 21
Power-On Reset (POR) . . . . . . . . . . . . . . . . . 21
Power-On Reset Override (PORO) . . . . . . . . 21
Time and date function . . . . . . . . . . . . . . . . . . 23
Register Minutes. . . . . . . . . . . . . . . . . . . . . . . 23
Register Hours . . . . . . . . . . . . . . . . . . . . . . . . 24
Register Days . . . . . . . . . . . . . . . . . . . . . . . . . 24
Register Weekdays. . . . . . . . . . . . . . . . . . . . . 24
Register Months . . . . . . . . . . . . . . . . . . . . . . . 25
Register Years . . . . . . . . . . . . . . . . . . . . . . . . 25
Alarm function. . . . . . . . . . . . . . . . . . . . . . . . . 27
DD
) . . . . . . . . . . . . . . . . . . . . . . . . . . 17
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 January 2013
Accurate RTC with integrated quartz crystal for automotive
8.9.2
8.9.3
8.9.4
8.9.5
8.9.6
8.10
8.10.1
8.10.2
8.10.3
8.10.4
8.10.5
8.11
8.11.1
8.11.2
8.11.3
8.11.3.1
8.11.3.2
8.11.3.3
8.11.3.4
8.11.3.5
8.11.3.6
8.11.3.7
8.11.4
8.12
8.12.1
8.12.2
8.12.3
8.12.4
8.12.5
8.12.6
8.12.7
8.13
8.14
9
9.1
9.1.1
9.2
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
10
11
12
Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Internal circuitry . . . . . . . . . . . . . . . . . . . . . . . 51
Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 52
Static characteristics . . . . . . . . . . . . . . . . . . . 53
Register Minute_alarm. . . . . . . . . . . . . . . . . . 28
Register Hour_alarm . . . . . . . . . . . . . . . . . . . 28
Register Day_alarm . . . . . . . . . . . . . . . . . . . . 28
Register Weekday_alarm. . . . . . . . . . . . . . . . 29
Alarm flag. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Timer functions. . . . . . . . . . . . . . . . . . . . . . . . 30
Register Watchdg_tim_ctl . . . . . . . . . . . . . . . 30
Register Watchdg_tim_val . . . . . . . . . . . . . . . 30
Watchdog timer function . . . . . . . . . . . . . . . . 31
Pre-defined timers: second and minute
interrupt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Clearing flags . . . . . . . . . . . . . . . . . . . . . . . . . 32
Timestamp function . . . . . . . . . . . . . . . . . . . . 34
Timestamp flag. . . . . . . . . . . . . . . . . . . . . . . . 34
Timestamp mode . . . . . . . . . . . . . . . . . . . . . . 35
Timestamp registers. . . . . . . . . . . . . . . . . . . . 35
Register Timestp_ctl . . . . . . . . . . . . . . . . . . . 35
Register Sec_timestp. . . . . . . . . . . . . . . . . . . 35
Register Min_timestp . . . . . . . . . . . . . . . . . . . 35
Register Hour_timestp . . . . . . . . . . . . . . . . . . 36
Register Day_timestp. . . . . . . . . . . . . . . . . . . 36
Register Mon_timestp . . . . . . . . . . . . . . . . . . 36
Register Year_timestp . . . . . . . . . . . . . . . . . . 36
Dependency between Battery switch-over
and timestamp . . . . . . . . . . . . . . . . . . . . . . . . 37
Interrupt output, INT. . . . . . . . . . . . . . . . . . . . 38
Minute and second interrupts. . . . . . . . . . . . . 39
INT pulse shortening . . . . . . . . . . . . . . . . . . . 40
Watchdog timer interrupts . . . . . . . . . . . . . . . 40
Alarm interrupts . . . . . . . . . . . . . . . . . . . . . . . 41
Timestamp interrupts . . . . . . . . . . . . . . . . . . . 41
Battery switch-over interrupts . . . . . . . . . . . . 41
Battery low detection interrupts . . . . . . . . . . . 41
External clock test mode . . . . . . . . . . . . . . . . 42
STOP bit function . . . . . . . . . . . . . . . . . . . . . . 43
SPI-bus interface . . . . . . . . . . . . . . . . . . . . . . 46
Data transmission . . . . . . . . . . . . . . . . . . . . . 46
I
Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
START and STOP conditions. . . . . . . . . . . . . 48
System configuration . . . . . . . . . . . . . . . . . . . 48
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 49
I
2
2
C-bus interface . . . . . . . . . . . . . . . . . . . . . . 48
C-bus protocol . . . . . . . . . . . . . . . . . . . . . . . 49
PCA2129T
© NXP B.V. 2013. All rights reserved.
continued >>
71 of 72