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PCF2128 데이터시트 PDF




NXP Semiconductors에서 제조한 전자 부품 PCF2128은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 PCF2128 기능
기능 Integrated RTC / TCXO / Crystal
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PCF2128 데이터시트, 핀배열, 회로
PCF2128
Integrated RTC / TCXO / Crystal
Rev. 00.03 — 4 June 2007
www.DataSheet4U.com
Preliminary [short] data sheet
1. General description
The PCF2128 is a ready to run CMOS real time clock/calendar with an integrated
temperature compensated crystal oscillator (TCXO). In timekeeping applications the high
accuracy of the PCF2128 allows it to be used as a replacement for costly and higher
powered long wave receivers or GPS receivers. A programmable battery switch-over
circuit enables an uninterruptible power supply and consequently continuous timekeeping.
The PCF2128 additionally features 512 bytes of general purpose RAM, a programmable
watchdog, a time stamp facility and a voltage monitoring facility. Programming is possible
using either an SPI or an I2C-bus interface.
2. Features
„ Integration of a 32.768 kHz quartz
„ 512 bytes of general purpose static
crystal in the same package as the RTC RAM
„ temperature compensated crystal
„ 1 second or 1 minute interrupt output
oscillator (TCXO) with integrated
capacitors.
„ accuracy:
„ oscillator stop detection
typically 3 ppm from20 °C to +70 °C,
typically 5 ppm from 40 °C to +85 °C
„ provides year, month, day, weekday, „ two line bi-directional 1 MHz fast mode
hours, minutes and seconds
plus I2C interface
„ programmable alarm function with
„ timestamp input
interrupt capability
„ programmable countdown timer with „ power-on reset
interrupt capability
„ programmable watchdog timer with
„ 3 line SPI interface with separate data
interrupt and reset capability
input and output (maximum speed
6.5 Mbits/s)
„ timestamp function with interrupt
„ programmable square wave output pin
capability
„ battery backup input pin and switch-over „ I2C-bus slave address: read A3H and
circuitry
write A2H
„ extra power fail detection with input and „ clock operating voltage: <tbd> to 5.5 V
output pins
„ battery low detection
„ low backup current; typical 0.95 μA at
„ battery backed output voltage pin
VDD = 3.0 V and Tamb = 25 °C
„ selectable I2C and SPI interface




PCF2128 pdf, 반도체, 판매, 대치품
NXP Semiconductors
6. Pinning information
6.1 Pinning
PCF2128
Real wtiwmwe.DcalotacSkhe/ect4aUle.cnodmar
SCL 1
SDI 2
SDO 3
SDA/CE 4
IFS 5
TS 6
CLKOUT 7
VSS 8
n.c. 9
n.c. 10
PCF2128
20 VDD
19 VBAT
18 VOUT
17 INT
16 RST
15 PFI
14 PFO
13 TEST
12 n.c.
11 n.c.
001aag060
Fig 2. Pin configuration SO20
Fig 3. SO20 (3d)
die
oscillator
001aag576
Table 3: Pin description PCF2128
Symbol Pin Description
SCL 1 combined serial clock input for both I2C
and SPI interface. May float when CE
inactive.
SDI 2 serial data input for SPI interface. May
float when CE inactive.
SDO
3 serial data output for SPI interface,
push-pull
SDA / CE 4
combined serial data input / output for the
I2C interface and chip enable input (active
LOW) for the SPI interface.
IFS 5 interface selector input
connect to ground to select the SPI
interface
connect to VOUT (pin 18) to select the
I2C interface
TS 6 timestamp input (active LOW) with 200 kΩ
internal pull-up resistor
CLKOUT 7 clock output (open drain)
VSS 8 ground
nc 9 Do not connect and do not use as feed
through.
nc 10 Do not connect and do not use as feed
through.
Symbol Pin Description
VDD 20 positive supply voltage
VBAT
VOUT
INT
RST
19 battery backup supply voltage
18 battery backed output voltage
17 interrupt output (open-drain; active
LOW)
16 reset output (open drain; active LOW)
PFI 15 power fail input
PFO
TEST
nc
nc
14 power fail output (open drain; active
LOW)
13 Do not connect and do not use as feed
through.
12 Do not connect and do not use as feed
through.
11 Do not connect and do not use as feed
through.
PCF2128_SDS_0
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
© NXP B.V. 2007. All rights reserved.
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PCF2128 전자부품, 판매, 대치품
NXP Semiconductors
PCF2128
Real wtiwmwe.DcalotacSkhe/ect4aUle.cnodmar
9. Revision history
Table 5. Revision history
Document ID
Release date Data sheet status
Change notice
PCF2128__SDS_00.03
Modifications:
<tbd>
Preliminary
Added Figure 3.
PCF2128__SDS_00.02
Modifications:
20070604
Preliminary
Datasheet text ammended. Section 8.1 corrected.
PCF2128__SDS_00.01 20070509
Preliminary short data sheet
Supersedes
PCF2128__SDS_00.02
PCF2128__SDS_00.01
-
PCF2128_SDS_0
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
© NXP B.V. 2007. All rights reserved.
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