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부품번호 PCF2127A 기능
기능 TCXO and quartz crystal
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PCF2127A 데이터시트, 핀배열, 회로
PCF2127A
Integrated RTC, TCXO and quartz crystal
Rev. 02 — 7 May 2010
www.DataSheet4U.com
Product data sheet
1. General description
The PCF2127A is a CMOS1 Real Time Clock (RTC) and calendar with an integrated
Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz
crystal optimized for very high accuracy and very low power consumption. The PCF2127A
has 512 bytes of general purpose static RAM, a selectable I2C-bus or SPI-bus, a backup
battery switch-over circuit, a programmable watchdog function, a timestamp function, and
many other features.
2. Features and benefits
„ Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
„ Typical accuracy: ±3 ppm from 15 °C to +60 °C
„ Integration of a 32.768 kHz quartz crystal and oscillator in the same package
„ Provides year, month, day, weekday, hours, minutes, and seconds
„ 512 bytes of general purpose static RAM
„ Timestamp function
‹ with interrupt capability
‹ detection of two different events on one multilevel input pin (e.g. for tamper
detection)
„ Two line bidirectional 400 kHz Fast-mode I2C-bus interface (IOL = 3 mA at pin
SDA/CE)
„ 3 line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
„ Battery backup input pin and switch-over circuitry
„ Battery backed output voltage pin
„ Battery low detection function
„ Extra power fail detection function with input and output pins
„ Power-On Reset Override (PORO)
„ Oscillator stop detection function
„ Interrupt output and system reset pin (open-drain)
„ Programmable 1 second or 1 minute interrupt
„ Programmable countdown timer with interrupt capability
„ Programmable watchdog timer with interrupt and reset capability
„ Programmable alarm function with interrupt capability
„ Programmable square wave open-drain output pin
„ Clock operating voltage: 1.2 V to 4.2 V
„ Low supply current: typical 0.65 μA at VDD = 3.0 V and Tamb = 25 °C
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.




PCF2127A pdf, 반도체, 판매, 대치품
NXP Semiconductors
7. Pinning information
7.1 Pinning
www.DataSheet4U.com
PCF2127A
Integrated RTC, TCXO and quartz crystal
SCL 1
SDI 2
SDO 3
SDA/CE 4
IFS 5
TS 6
CLKOUT 7
VSS 8
n.c. 9
n.c. 10
PCF2127A
20 VDD
19 VBAT
18 BBS
17 INT
16 RST
15 PFI
14 PFO
13 TEST
12 n.c.
11 n.c.
001aaj676
Top view. For mechanical details, see Figure 53.
Fig 2. Pin configuration for SO20 (PCF2127A)
7.2 Pin description
Table 3. Pin description of SO20 (PCF2127A)
Symbol
Pin Description
SCL 1 combined serial clock input for both I2C-bus and SPI-bus; may
float when SDA/CE inactive
SDI 2 serial data input for SPI-bus; may float when SDA/CE inactive
SDO
3 serial data output for SPI-bus, push-pull
SDA/CE
4
combined serial data input and output for the I2C interface and chip
enable input (active LOW) for the SPI-bus
IFS 5 interface selector input
connect to pin VSS to select the SPI-bus
connect to pin BBS to select the I2C interface
TS
CLKOUT
6
7
timestamp input (active LOW) with 200 kΩ internal pull-up resistor
(RPU)
clock output (open-drain)
VSS 8 ground supply voltage
n.c. 9 to 12 not connected; do not connect; do not use as feed through
TEST
13 do not connect; do not use as feed through
PFO
14 power fail output (open-drain; active LOW)
PFI 15 power fail input
RST 16 reset output (open-drain; active LOW)
INT 17 interrupt output (open-drain; active LOW)
BBS 18 output voltage (battery backed)
VBAT
VDD
19 battery supply voltage (backup)
20 supply voltage
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
4 of 80

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PCF2127A 전자부품, 판매, 대치품
NXP Semiconductors
www.DataSheet4U.com
PCF2127A
Integrated RTC, TCXO and quartz crystal
Address registers 1Ah and 1Bh define the RAM address. Address register 1Ch
(RAM_wrt_cmd) is the RAM write command; address register 1Dh (RAM_rd_cmd) is
the RAM read command. Data is transferred to or from the RAM via the serial
interface (see Section 8.5).
The registers Seconds, Minutes, Hours, Days, Months, and Years are all coded in
Binary Coded Decimal (BCD) format to simplify application use. Other registers are
either bit-wise or standard binary.
When one of the RTC registers is written or read, the content of all counters is temporarily
frozen. This prevents a faulty writing or reading of the clock and calendar during a carry
condition (see Section 8.9.8).
Table 4. Register overview
Bit positions labeled as - are not implemented and will return a 0 when read. Bit T must always be written with logic 0. Bits
labeled as X are undefined at power-on and unchanged by subsequent resets.
Address Register name Bit
Reset value
76543210
Control registers
00h Control_1
EXT_ T
TEST
STOP TSF1 POR_ 12_24 MI SI 0000 0000
OVRD
01h Control_2
MSF WDTF TSF2 AF
CDTF TSIE AIE
CDTIE 0000 0000
02h Control_3
PWRMNG[2:0]
BTSE BF
BLF BIE
BLIE 0000 0000
Time and date registers
03h Seconds
OSF
SECONDS (0 to 59)
1XXX XXXX
04h Minutes
-
MINUTES (0 to 59)
- XXX XXXX
05h Hours
--
AMPM HOURS (1 to 12) in 12 h mode
- - XX XXXX
HOURS (0 to 23) in 24 h mode
- - XX XXXX
06h Days
--
DAYS (1 to 31)
- - XX XXXX
07h Weekdays
-
-
-
-
-
WEEKDAYS (0 to 6) - - - - - XXX
08h Months
---
MONTHS (1 to 12)
- - - X XXXX
09h Years
YEARS (0 to 99)
XXXX XXXX
Alarm registers
0Ah Second_alarm AE_S
SECOND_ALARM (0 to 59)
1XXX XXXX
0Bh Minute_alarm AE_M
MINUTE_ALARM (0 to 59)
1XXX XXXX
0Ch Hour_alarm
AE_H -
AMPM HOUR_ALARM (1 to 12) in 12 h mode
1 - XX XXXX
- HOUR_ALARM (0 to 23) in 24 h mode
1 - XX XXXX
0Dh Day_alarm
AE_D -
DAY_ALARM (1 to 31)
1 - XX XXXX
0Eh Weekday_alarm AE_W - - - - WEEKDAY_ALARM (0 to 6) 1 - - - - XXX
CLKOUT control register
0Fh
CLKOUT_ctl
TCR[1:0]
- - - COF[2:0]
00 - - - 000
Watchdog registers
10h Watchdg_tim_ctl WD_CD[1:0] TI_TP - - - TF[1:0]
000 - - - 11
11h Watchdg_tim_val WATCHDG_TIM_VAL[7:0]
XXXX XXXX
Timestamp registers
12h Timestp_ctl
TSM TSOFF -
1_O_16_TIMESTP[4:0]
00 - X XXXX
13h Sec_timestp -
SECOND_TIMESTP (0 to 59)
- XXX XXXX
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
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PCF2127A

TCXO and quartz crystal

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