Datasheet > D1672-2

D1672-2

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
美信 - MAXIM		计数器
页数	文件大小	规格书
15页	515K
描述
I2C 32-Bit Binary Counter RTC

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D1672-2 数据手册

DS1672

PIN DESCRIPTION

NAME

FUNCTION

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 6pF. For more information about crystal selection and

crystal layout considerations, refer to Application Note 58: Crystal

Considerations with Dallas Real-Time Clocks. The DS1672 can also be driven

by an external 32.768kHz oscillator. In this configuration, the X1 pin is

connected to the external oscillator signal and the X2 pin is floated^.

Battery Input for Any Standard 3V Lithium Cell or Other Energy Source.

Battery voltage must be held between 1.3V and 3.63V for proper operation.

Diodes placed in series between the power source and the V_BACKUPmay result

1, 2

X1, X2

V_BACKUPin improper operation. If a backup supply is not required, V_BACKUPmust be

grounded. UL recognized to ensure against reverse charging current when used

in conjunction with a lithium battery (charger disabled). See “Conditions of

Acceptability” at www.maxim-ic.com/qa/info/ul.

GND

Ground. DC power is provided to the device on this pin.

Serial-Data Input/Output. SDA is the input/output pin for the I²C serial

interface. The SDA pin is open drain and requires an external pullup resistor.

I²C Serial-Clock Input. SCL is used to synchronize data movement on the

serial interface and requires an external pullup resistor.

SDA

SCL

Active-Low Reset Output. It functions as a microprocessor reset signal. This

pin is an open-drain output and requires an external pullup resistor.

RST

Power Pin for Primary Power Supply. When V_CCis applied within normal

V_CC

limits, the device is fully accessible and data can be written and read. When

V_CCis below V_PF, reads and writes are inhibited.

Figure 3. Recommended Layout for Crystal

LOCAL GROUND PLANE (LAYER 2)

CRYSTAL

GND

7 of 15

1...4 5 678 9 10...15

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