CD1302 Clock chip with trickle charging-ChisynV Microelectronics (Beijing) Co., Ltd.

The CD1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. Interfacing the CD1302 with a microprocessor is simplified by using synchronous serial communication. Only three wires are required to communicate with the clock/RAM: CE, I/O (data line), and SCLK (serial clock). Data can be transferred to and from the clock/RAM 1 byte at a time or in a burst of up to 31 bytes. The CD1302 is designed to operate on very low power and retain data and clock information on less than 1µW. The CD1302 has the additional features of dual power pins for primary and backup power supplies, programmable trickle charger for VCC1, and seven additional bytes of scratchpad memory.

Parameters

Supply(V):2 to 5.5
Time holding current(nA):0.2
Load Capacitance(pF):6
Memory Type:NV SRAM
Interface:3-Wire
Function:RTC

Features

Completely Manages All Timekeeping Functions

Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 31 x 8 Battery-Backed General-Purpose RAM
Simple Serial Port Interfaces to Most Microcontrollers

Simple 3-Wire Interface

TTL-Compatible (VCC = 5V)

Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock or RAM Data
Low Power Operation Extends Battery Backup Run Time

2.0V to 5.5V Full Operation

Uses Less Than 300nA at 2.0V
8-Pin SOP Package
Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications

Application

Consumer electronics (set-top boxes, data recording, network applications)
Handheld devices (GPS, POS terminals)
Medical (blood glucose meter, medication counter)
Office equipment (fax/printer, photocopier)
Other (electricity meters, vending machines, temperature monitors, modems)
Telecommunications (routers, switches, servers)

Parameters

MALL MALL

Part Number

Package

电源电压(V)

计时电流(uA)

负载电容(pF)

存储器类型

接口

功能

Temp Range(°C)

Open

CD1302AS8

CD1302涓流充电计时芯片包含实时时钟/日历和31字节静态RAM。它通过简单的串行接口与微处理器通信。实时时钟/日历提供秒、分、时、星期、日期、月和年信息。对于少于31天的月份，月底的日期会自动调整，包括针对闰年的更正。时钟以24小时制或带AM/PM指示器的12小时制运行。通过使用同步串行通信，简化了CD1302与微处理器的接口。只需三根线即可与时钟/RAM通信：CE、I/O（数据线）和SCLK（串行时钟）。在与时钟/RAM之间进行数据传输时，可以一次1个字节，也可以在一次突发中包含多达31个字节。CD

Datasheet

PackageSOP-8

电源电压(V) 2 to 5.5

计时电流(uA) 0.2

负载电容(pF) 6

存储器类型 NV SRAM

接口 3-Wire

功能 RTC

Temp Range(°C) -40 to 85

Open

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CD1302 | CAD Modle