DS3231MZ/V 查看數據表（PDF） - Maxim Integrated

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DS3231MZ/V

±5ppm, I2C Real-Time Clock

Maxim Integrated 

±5ppm, I2C Real-Time Clock

TOP VIEW

32KHZ 1

VCC 2

INT/SQW 3

RST 4

N.C. 5

N.C. 6

N.C. 7

N.C. 8

+

DS3231M

SO

16 SCL

15 SDA

14 VBAT

13 GND

12 N.C.

11 N.C.

10 N.C.

9 N.C.

Pin Configuration

TOP VIEW

+

32KHZ 1

VCC 2

INT/SQW 3

DS3231M

RST 4

SO

8 SCL

7 SDA

6 VBAT

5 GND

Pin Description

PIN

8 SO 16 SO

1

1

2

2

3

3

4

4

—

5–12

5

13

6

14

NAME

32KHZ

VCC

INT/

SQW

RST

N.C.

GND

VBAT

FUNCTION

32.768kHz Output (50% Duty Cycle). This open-drain pin requires an external pullup resistor.

When enabled with the EN32KHZ bit in the Status register (0Fh), this output operates on either

power supply. This pin can be left open circuit if not used.

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.

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

resistor connected to a supply at 5.5V 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.

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 connected. If the oscillator is disabled, tREC is bypassed and

RST immediately goes high.

No Connection. These pins must be connected to ground.

Ground

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.maxim-ic.com/qa/info/ul for more information.

7

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