DS3232MZ+【PDF 22/23 页】IC RTC W/SRAM I2C 8SOIC

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DS3232M

±5ppm, I2C Real-Time Clock with SRAM

Maxim Integrated

Pin Configuration

Pin Description

NAME

FUNCTION

32KHZ

32.768KHZ Output (Push-Pull Output, 50% Duty Cycle). If enabled (EN32KHZ = 1), the 32kHz output is

active on VCC. If enabled for battery operation (BB32KHZ = 1), the output is also active on VBAT. When

disabled, the output is forced low. This pin can be left unconnected if not used.

VCC

DC Power Pin for Primary Power Supply. This pin should be decoupled using a 0.1FF to 1.0FF capacitor.

Connect to ground if not used.

INT/

SQW

Active-Low Interrupt or 1Hz Square-Wave Output. This open-drain pin requires an external pullup resistor

connected to a supply at 4.5V or less. It can be left open if not used. This multifunction pin is determined

by the state of the INTCN bit in the Control register (0Eh). When INTCN is set to logic 0, this pin outputs

a 1Hz square wave. When INTCN is set to logic 1, a match between the timekeeping registers and either

of the alarm registers activates the INT/SQW pin (if the alarm is enabled). Because the INTCN bit is set to

logic 1 when power is first applied, the pin defaults to an interrupt output with alarms disabled.

RST

Active-Low Reset. This pin is an open-drain input/output. It indicates the status of VCC relative to the VPF

specification. As VCC falls below VPF, the RST pin is driven low. When VCC exceeds VPF, for tRST, the

RST pin is pulled high by the internal pullup resistor. The active-low, open-drain output is combined with

a debounced pushbutton input function. This pin can be activated by a pushbutton reset request. It has

an internal 50kI (RPU) nominal value pullup resistor to VCC. No external pullup resistors should be con-

nected. If the oscillator is disabled, tREC is bypassed and RST immediately goes high.

GND

Ground

VBAT

Backup Power-Supply Input. When using the device with the VBAT input as the primary power source, this

pin should be decoupled using a 0.1FF to 1.0FF low-leakage capacitor. When using the device with the VBAT

input as the backup power source, the capacitor is not required. If VBAT is not used, connect to ground. The

device is UL recognized to ensure against reverse charging when used with a primary lithium battery. Go to

www.maximintegrated.com/qa/info/ul for more information.

SDA

Serial-Data Input/Output. This pin is the data input/output for the I2C serial interface. This open-drain pin

requires an external pullup resistor. The pullup voltage can be up to 4.5V, regardless of the voltage on VCC.

SCL

Serial-Clock Input. This pin is the clock input for the I2C serial interface and is used to synchronize data

movement on the serial interface. The pullup voltage can be up to 4.5V, regardless of the voltage on VCC.

DS3232M

VBAT

GND

RST

SCL

SDA

VCC

INT/SQW

32KHZ

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