PCF2123TS/1.118 NXP Semiconductors, PCF2123TS/1.118 Datasheet - Page 39

• Manufacturer Part Number: PCF2123TS/1.118
• Manufacturer: NXP Semiconductors

Specifications of PCF2123TS/1.118

• Bus Type: Serial (3-Wire, SPI)
• Package Type: TSSOP
• Operating Supply Voltage (max): 5.5V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Mounting: Surface Mount
• Date Format: DW:DM:M:Y
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Compliant

NXP Semiconductors
9. Internal circuitry
PCF2123
Product data sheet
The watchdog is implemented to prevent the excessive loss of time due to interface
access failure e.g. if main power is removed from a battery backed-up system during an
interface access.
Each time the watchdog period is exceeded, 1 s will be lost from the time counters. The
watchdog will trigger between 1 s and 2 s after receiving a valid subaddress.
Fig 27. Device diode protection diagram of PCF2123
All information provided in this document is subject to legal disclaimers.
Rev. 03 — 5 October 2010
OSCO
TEST
OSCI
V
INT
CE
SS
PCF2123
V
CLKOE
CLKOUT
SCL
SDI
SDO
001aai552
DD
SPI Real time clock/calendar
PCF2123
© NXP B.V. 2010. All rights reserved.
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