PCF2128T PHILIPS [NXP Semiconductors], PCF2128T Datasheet

PCF2128T

Manufacturer Part Number

PCF2128T

Description

Integrated RTC / TCXO / Crystal

Manufacturer

PHILIPS [NXP Semiconductors]

Datasheet

1.PCF2128T.pdf (10 pages)

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1. General description

2. Features

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 I

PCF2128

Integrated RTC / TCXO / Crystal

Rev. 00.03 — 4 June 2007

Integration of a 32.768 kHz quartz

crystal in the same package as the RTC

temperature compensated crystal

oscillator (TCXO) with integrated

capacitors.

accuracy:

typically 3 ppm from−20 °C to +70 °C,

typically 5 ppm from −40 °C to +85 °C

provides year, month, day, weekday,

hours, minutes and seconds

programmable alarm function with

interrupt capability

programmable countdown timer with

interrupt capability

programmable watchdog timer with

interrupt and reset capability

timestamp function with interrupt

capability

battery backup input pin and switch-over

circuitry

extra power fail detection with input and

output pins

battery low detection

battery backed output voltage pin

C-bus interface.

512 bytes of general purpose static

RAM

1 second or 1 minute interrupt output

oscillator stop detection

two line bi-directional 1 MHz fast mode

plus I

timestamp input

power-on reset

3 line SPI interface with separate data

input and output (maximum speed

6.5 Mbits/s)

programmable square wave output pin

write A2H

clock operating voltage: <tbd> to 5.5 V

low backup current; typical 0.95 μA at

selectable I

C-bus slave address: read A3H and

= 3.0 V and T

Preliminary [short] data sheet

C interface

C and SPI interface

amb

= 25 °C

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PCF2128T Summary of contents

Page 1

PCF2128 Integrated RTC / TCXO / Crystal Rev. 00.03 — 4 June 2007 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 ...

Page 2

... T ambient temperature amb T storage temperature stg 4. Ordering information Table 2: Ordering information Type number Topside Package mark Name PCF2128T / 1 PCF2128T SO20 PCF2128_SDS_0 Preliminary [short] data sheet − + ° unless otherwise specified. Conditions interface active f = 6.5 MHz SCL f = 1.0 MHz ...

Page 3

NXP Semiconductors 5. Block diagram 7 CLKOUT 18 V OUT BATTERY BACK SWITCH-OVER BAT 8 CIRCUITRY V SS OSCILLATOR MONITOR 16 RST 4 SDA/CE 3 SDO SERIAL BUS 2 INTERFACE SDI 1 SCL 5 ...

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NXP Semiconductors 6. Pinning information 6.1 Pinning SCL 1 SDI 2 SDO 3 4 SDA/CE 5 IFS PCF2128 TS 6 CLKOUT n. n.c. 001aag060 Fig 2. Pin configuration SO20 Table 3: Pin description PCF2128 ...

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NXP Semiconductors 7. Limiting values Table 4: Symbol BAT tot T amb T stg 7.1 ESD values • ESD protection exceeds 2000 V HBM per JESD22-A114, ...

Page 6

NXP Semiconductors 8.1 Application example 8.1.1 Timekeeping, power management, CLKOUT, timestamp and interface active PCF2128 used for timekeeping, power management, CLKOUT and timestamp functions (see Figure V = 2 microcontroller SCL SDI from PCF2128 SDO INT ...

Page 7

NXP Semiconductors 9. Revision history Table 5. Revision history Document ID Release date PCF2128__SDS_00.03 <tbd> • Modifications: Added PCF2128__SDS_00.02 20070604 • Modifications: Datasheet text ammended. PCF2128__SDS_00.01 20070509 PCF2128_SDS_0 Preliminary [short] data sheet Data sheet status Preliminary . Figure 3 Preliminary ...

Page 8

NXP Semiconductors 10. Legal information 10.1 Data sheet status [1][2] Document status Product status Objective [short] data sheet Development Preliminary [short] data sheet Qualification Product [short] data sheet Production [1] Please consult the most recently issued document before initiating or ...

Page 9

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NXP Semiconductors 12. Contents 1 General description . . . . . . . . . . . . . . . . . . . . . . 1 2 Features . . . . . . . . ...

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