PCF2129AT Overview
20 pins are attached to it.
PCF2129AT Features
20 pin count

PCF2129AT Applications
There are a lot of NXP Semiconductors
PCF2129AT Real Time Clocks applications.

Automotive
Industrial
Digital still camera
Digital video camera
Printers
Copy machines
Mobile equipment
Battery powered devices
Printers and copiers
Electronic metering

ECCN (US)	EAR99
HTS	8542.39.00.01
Bus Type	Serial (3-Wire, I2C, SPI)
Minimum Operating Supply Voltage (V)	1.8
Typical Operating Supply Voltage (V)	3.3|2.5
Maximum Operating Supply Voltage (V)	4.2
Maximum Power Dissipation (mW)	300
Minimum Operating Temperature (°C)	-40
Maximum Operating Temperature (°C)	85
Supplier Package	SO
Mounting	Surface Mount
Package Height	2.45(Max)
Package Length	13(Max)
Package Width	7.6(Max)
PCB changed	20
RoHS	Non-Compliant
Part Status	Active
Pin Count	20
Function	Clock/Calendar
Time Format	HH:MM:SS
Date Format	DW:DM:M:Y
RoHS Status	Supplier Unconfirmed