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NXP Semiconductors Electronic Components Datasheet

PCF2128 Datasheet

Integrated RTC / TCXO / Crystal

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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


NXP Semiconductors Electronic Components Datasheet

PCF2128 Datasheet

Integrated RTC / TCXO / Crystal

No Preview Available !

NXP Semiconductors
PCF2128
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3. Quick reference data
Table 1. Quick reference data
VDD = 1.8 to 5.5 V; VSS = 0 V; Tamb = 40 to +85 °C unless otherwise specified.
Symbol Parameter
Conditions
VDD supply voltage
IDD supply current
interface active
fSCL = 6.5 MHz
fSCL = 1.0 MHz
interface inactive (fSCL = 0 kHz)
timekeeping and power management
configuration, CLKOUT disabled;
VDD = 5.0 V
VDD = 3.0 V
interface inactive (fSCL = 0 kHz)
timekeeping configuration; Tamb = +25 °C
VDD = 5.0 V
fSCL
Δf / f
Tamb
Tstg
SCL clock frequency
frequency stability
(fo = 32.768 kHz)
ambient temperature
storage temperature
VDD = 3.0 V
Tamb = 40 to +85 °C
Tamb = 20 to +70 °C
operating
4. Ordering information
Min Typ Max Unit
1.8 -
5.5 V
- - 800 μA
- - 200 μA
- 2700 - nA
- 2100 - nA
- 850 - nA
- 450 - nA
0-
6.5 MHz
- ±5 - ppm
- ±3 ±5 ppm
40 -
+85 °C
65 -
+150 °C
Table 2: Ordering information
Type number Topside
mark
Package
Name Description
PCF2128T / 1 PCF2128T SO20 plastic thin shrink small outline package; 20 leads; body width 4.4mm
Version
SOT163-1
PCF2128_SDS_0
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
© NXP B.V. 2007. All rights reserved.
2 of 10


Part Number PCF2128
Description Integrated RTC / TCXO / Crystal
Maker NXP Semiconductors
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PCF2128 Datasheet PDF






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