|
|
Número de pieza | PCA2125 | |
Descripción | SPI Real-time clock/calendar | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de PCA2125 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
No Preview Available ! PCA2125
SPI Real-time clock/calendar
Rev. 01 — 28 July 2008
www.DataSheet4U.com
Product data sheet
1. General description
The PCA2125 is a CMOS real-time clock/calendar optimized for low-power consumption
and an operating temperature up to 125 °C. Data is transferred via a Serial Peripheral
Interface (SPI) bus with a maximum data rate of 6.0 Mbit/s. An alarm and timer function
are also available with the possibility to generate a wake-up signal on an interrupt pin.
AEC Q100 qualified for automotive applications.
2. Features
I Provides year, month, day, weekday, hours, minutes and seconds based on
32.768 kHz quartz crystal
I Resolution: seconds to years
I Clock operating voltage: 1.3 V to 5.5 V
I Low backup current: typical 0.55 µA at VDD = 3.0 V and Tamb = 25 °C
I 3-line SPI-bus with separate combinable data input and output
I Serial interface (at VDD = 1.6 V to 5.5 V)
I 1 second or 1 minute interrupt output
I Freely programmable timer with interrupt capability
I Freely programmable alarm function with interrupt capability
I Integrated oscillator capacitor
I Internal power-on reset
I Open-drain interrupt pin
3. Applications
I Automotive time keeping application
I Metering
4. Ordering information
Table 1. Ordering information
Type number Package
Name
Description
PCA2125TS
TSSOP14 plastic thin shrink small outline package; 14 leads;
body width 4.4 mm
Version
SOT402-1
1 page NXP Semiconductors
www.DataSheet4U.com
PCA2125
SPI Real-time clock/calendar
[2] Ten’s place in 24 h mode.
8.2 Reset
The PCA2125 includes an internal reset circuit which is active whenever the oscillator is
stopped; see Figure 3. The oscillator can be stopped, for example, by connecting one of
the oscillator pins OSCI or OSCO to ground.
osc stopped
OSCILLATOR
0 = stopped, 1 = running
SDI POR
OVERRIDE 0 = override inactive
1 = override active
CE CLEAR
reset
Bit 0 = clear override mode
POR_OVRD 1 = override possible
001aaf898
Fig 3. Reset system
The oscillator is considered to be stopped during the time between power-up and stable
crystal resonance; see Figure 4. This time can be in the range 200 ms to 2 s depending
on crystal type, temperature and supply voltage. Whenever an internal reset occurs, the
reset flag bit RF is set.
PCA2125_1
Product data sheet
VDD
chip in reset
chip not in reset
oscillation
internal
reset
Fig 4. Power-on reset
t
001aaf897
Table 5. Register reset value
Bits labeled ‘-’ are not implemented and will return a ‘0’ when read. Bits labeled ‘X’ are undefined at
power-up and unchanged by subsequent resets.
Address Register name
Bit
76543210
00h Control_1
000 - 10 - -
01h Control_2
00000000
02h Seconds
1XXXXXXX
03h Minutes
- XXXXXXX
04h Hours
- - XXXXXX
05h Days
- - XXXXXX
06h Weekdays
- - - - - XXX
Rev. 01 — 28 July 2008
© NXP B.V. 2008. All rights reserved.
5 of 36
5 Page NXP Semiconductors
www.DataSheet4U.com
PCA2125
SPI Real-time clock/calendar
Table 19. Register Hour_alarm (address 0Ah) bit description
Bit Symbol
Value Description
7 AEN_H
0 hour alarm is enabled
1 hour alarm is disabled
6-
0 unused
12 hour mode
5 AMPM
0 indicates AM
1 indicates PM
4 to 0 HOUR_ALARM
01 to 12 this register holds the hour alarm value coded in BCD
format when in 12 hour mode
24 hour mode
5 to 0 HOUR_ALARM
00 to 23 this register holds the hour alarm value coded in BCD
format when in 24 hour mode
Table 20. Register Day_alarm (address 0Bh) bit description
Bit Symbol
Value Description
7 AEN_D
0 day alarm is enabled
1 day alarm is disabled
6-
0 unused
5 to 0 DAY_ALARM
01 to 31 this register holds the day alarm value coded in BCD
format
Table 21. Register Weekday_alarm (address 0Ch) bit description
Bit Symbol
Value Description
7 AEN_W
0 weekday alarm is enabled
1 weekday alarm is disabled
3 to 6 -
0 unused
2 to 0 WEEKDAY_ALARM 0 to 6 this register holds the weekday alarm value
PCA2125_1
Product data sheet
Rev. 01 — 28 July 2008
© NXP B.V. 2008. All rights reserved.
11 of 36
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet PCA2125.PDF ] |
Número de pieza | Descripción | Fabricantes |
PCA2125 | SPI Real-time clock/calendar | NXP Semiconductors |
Número de pieza | Descripción | Fabricantes |
SLA6805M | High Voltage 3 phase Motor Driver IC. |
Sanken |
SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |