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부품번호 | PCF2128 기능 |
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기능 | Integrated RTC / TCXO / Crystal | ||
제조업체 | NXP Semiconductors | ||
로고 | |||
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 from−20 °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
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
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.
7 of 10
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |