DS3234 데이터 시트보기 (PDF) - Maxim Integrated

부품명

상세내역

제조사

DS3234

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM

Maxim Integrated 

DS3234

Extremely Accurate SPI Bus RTC

with Integrated Crystal and SRAM

Pin Configuration

TOP VIEW

CS 1

N.C. 2

32kHz 3

VCC 4

INT/SQW 5

RST 6

N.C. 7

N.C. 8

N.C. 9

N.C. 10

DS3234

20 SCLK

19 DOUT

18 SCLK

17 DIN

16 VBAT

15 GND

14 N.C.

13 N.C.

12 N.C.

11 N.C.

SO

Pin Description

PIN

1

2, 7–14

3

4

NAME

CS

N.C.

32kHz

VCC

FUNCTION

Active-Low Chip Select Input. Used to select or deselect the device.

No Connection. Not connected internally. Must be connected to ground.

32kHz Push-Pull Output. If disabled with either EN32kHz = 0 or BB32kHz = 0, the state of the 32kHz pin will be

low.

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

Active-Low Interrupt or Square-Wave Output. This open-drain pin requires an external pullup resistor. 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 square wave and its frequency is determined by RS2

5 INT/SQW and RS1 bits. When INTCN is set to logic 1, then 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. The pullup voltage can

be up to 5.5V, regardless of the voltage on VCC. If not used, this pin can be left unconnected.

6

15

16

17

18, 20

19

RST

GND

VBAT

DIN

SCLK

DOUT

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 driven high impedance. 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 50k_ nominal value

pullup resistor to VCC. No external pullup resistors should be connected. On first power-up, or if the crystal

oscillator is disabled, tRST is bypassed and RST immediately goes high.

Ground

Backup Power-Supply Input. If VBAT is not used, connect to ground. Diodes placed in series between the VBAT

pin and the battery can cause improper operation. UL recognized to ensure against reverse charging when

used with a lithium battery. Go to www.maximintegrated.com/qa/info/ul.

SPI Data Input. Used to shift address and data into the device.

SPI Clock Input. Used to control timing of data into and out of the device. Either clock polarity can be used. The

clock polarity is determined by the device based on the state of SCLK when CS goes low. Pins 18 and 20 are

electrically connected together internally.

SPI Data Output. Data is output on this pin when the device is in read mode; CMOS push-pull driver.

www.maximintegrated.com

Maxim Integrated | 8

Share Link: