Datasheet > 1339

1339

更新时间： 2023-12-20 18:45:24

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
28页	1070K
描述
Real-Time Clock With Serial I2C Interface

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1339 数据手册

1339 Datasheet

Pin Assignment (8-TSSOP/8-SOIC)

Pin Assignment (16-SOIC)

VCC

SCL

SQW/INT

VCC

SDA

SQW/INT

SCL

GND

1339

V_BACKUP

GND

SDA

1339C

Pin Descriptions

Number

Name

Pin Description/Function

TSSOP SOIC

—

Connections for standard 32.768kHz quartz crystal. The internal oscillator circuitry is

designed for operation with a crystal having a specified load capacitance (CL) of 7pF. An

external 32.768kHz oscillator can also drive the 1339. In this configuration, the X1 pin is

connected to the external oscillator signal and the X2 pin is left floating.

V_BACKUPBackup supply input. Supply voltage must be held between 1.3V and 3.7V for proper

operation. This pin can be connected to a primary cell, such as a lithium button cell.

Additionally, this pin can be connected to a rechargeable cell or a super cap that can be

charged using the trickle charger circuit. Diodes placed in series between the backup

source and the VBAT pin may prevent proper operation. If a backup supply is not required,

VBAT must be connected to ground. UL recognized to ensure against reverse charged

current when used with a lithium cell.

GND

SDA

Connect to ground. DC power is provided to the device on these pins.

Serial data input/output. SDA is the input/output pin for the I²C serial interface. The SDA

pin is an open-drain output and requires an external pull-up resistor (2k typical).

SCL

Serial clock input. SCL is used to synchronize data movement on the serial interface. It is

an open-drain output and requires an external pull-up resistor (2k typical).

SQW/INT Square-Wave/Interrupt output. Programmable square-wave or interrupt output signal. The

SQW/INT pin is an open-drain output and requires an external pull-up resistor (10k

typical).

V_CC

Primary power supply. When voltage is applied within normal limits, the device is fully

accessible and data can be written and read.

—

4 - 13

No connect. These pins are unused and must be connected to ground.

April 4, 2023

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