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PDF PCF2128 Data sheet ( Hoja de datos )
| Número de pieza | PCF2128 | |
| Descripción | Integrated RTC / TCXO / Crystal | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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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 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
1 page  
NXP Semiconductors
PCF2128
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7. Limiting values
Table 4:
Symbol
VDD
VBAT
IDD
VI
VO
II
IO
Ptot
Tamb
Tstg
Limiting valuesIn accordance with the Absolute Maximum Rating System (IEC 60134).
Parameter
Conditions
Min Max Unit
supply voltage
−0.5 +6.5 V
backup battery supply
voltage
−0.5 +6.5 V
supply current
−50 +50 mA
input voltage
−0.5 +6.5 V
output voltage
−0.5 +6.5 V
input current
−10 +10 mA
output current
−10 +10 mA
total power dissipation
- 300 mW
ambient temperature
−40 +85 °C
storage temperature
−65 +150 °C
7.1 ESD values
• ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per
JESD22-A115 and 2000 V CDM per JESD22-C101.
• Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA.
8. Application information
• The PCF2128 is a ready to run real time clock; no external quartz is required.
• You can set different configurations in your application depending on the PCF2128
functions you want to use.
• The integration of the quartz crystal in the same package as the RTC has the
following advantages:
– elimination of crystal procurement issues
– elimination of RTC frequency tuning
– no more crystal PCB layout issues.
• You can select the SPI or I2C-bus interface using the IFS pin.
• By connecting a battery to VBAT an uninterruptible power supply is guaranteed.
• You can use the battery backed voltage VOUT to supply an external RAM to retain
RAM data in battery backup mode.
• You can connect PFI through an external voltage divider to VDD to allow extra power
fail detection. If not used, connect PFI to VSS.
• You can connect the timestamp input pin TS to a push button for tamper detection.
PCF2128_SDS_0
Preliminary [short] data sheet
Rev. 00.03 — 4 June 2007
© NXP B.V. 2007. All rights reserved.
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