DS1306EN/T&R【PDF 16/22 页】IC RTC SERIAL ALARM IND 20-TSSOP

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录1993

12页 13页 14页 15页 [16页]17页 18页 19页 20页

DS1306

3 of 22

PIN DESCRIPTION (continued)

PIN

TSSOP

DIP

NAME

FUNCTION

1Hz

1Hz Output. The 1Hz pin provides a 1Hz square wave output. This output

is active when the 1 Hz bit in the control register is a logic 1. Both

INT0 and

1Hz pins are open-drain outputs. The interrupt, 1Hz signal, and the internal

clock continue to run regardless of the level of VCC (as long as a power

source is present).

GND

Ground

SERMODE

Serial Interface Mode. The SERMODE pin offers the flexibility to choose

between two serial interface modes. When connected to GND, standard

3-wire communication is selected. When connected to VCC, SPI

communication is selected.

Chip Enable. The chip enable signal must be asserted high during a read or

a write for both 3-wire and SPI communication. This pin has an internal

55k

pulldown resistor (typical).

SCLK

Serial Clock. SCLK is used to synchronize data movement on the serial

interface for either the SPI or 3-wire interface.

SDI

Serial Data In. When SPI communication is selected, the SDI pin is the

serial data input for the SPI bus. When 3-wire communication is selected,

this pin must be tied to the SDO pin (the SDI and SDO pins function as a

single I/O pin when tied together).

SDO

Serial Data Out. When SPI communication is selected, the SDO pin is the

serial data output for the SPI bus. When 3-wire communication is selected,

this pin must be tied to the SDI pin (the SDI and SDO pins function as a

single I/O pin when tied together). VCCIF provides the logic-high level.

VCCIF

Interface Logic Power-Supply Input. The VCCIF pin allows the DS1306 to

drive SDO and 32kHz output pins to a level that is compatible with the

interface logic, thus allowing an easy interface to 3V logic in mixed supply

systems. This pin is physically connected to the source connection of the

p-channel transistors in the output buffers of the SDO and 32kHz pins.

32kHz

32.768kHz Output. The 32kHz pin provides a 32.768kHz output. This

signal is always present. VCCIF provides the logic-high level.

VCC1

Primary Power Supply. DC power is provided to the device on this pin.

VCC1 is the primary power supply.

4, 6, 13,

—

N.C.

No Connection

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式