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DS12R885_07

更新时间： 2024-09-21 02:57:35
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
23页 293K
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RTC with Constant-Voltage Trickle Charger

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DS12R885_07 数据手册

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Rev 5; 2/07  
RTC with Constant-Voltage Trickle Charger  
5C/DS12R87  
General Description  
Features  
♦ Trickle-Charge Capability for a Rechargeable  
The DS12R885 is a functional drop-in replacement for  
the DS12885 real-time clock (RTC). The device pro-  
vides an RTC/calendar, one time-of-day alarm, three  
maskable interrupts with a common interrupt output, a  
programmable square wave, and 114 bytes of battery-  
backed static RAM. The date at the end of the month is  
automatically adjusted for months with fewer than 31  
days, including correction for leap years. It also oper-  
ates in either 24-hour or 12-hour format with an AM/PM  
indicator. A precision temperature-compensated circuit  
Battery or Super Cap  
♦ Selectable Intel or Motorola Bus Timing  
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,  
Month, and Year with Leap-Year Compensation to  
2100  
♦ Interrupt Output with Three Independently  
Maskable Interrupt Flags  
♦ Time-of-Day Alarm is Once-per-Second to Once-  
per-Day  
♦ Periodic Rates from 122μs to 500ms  
♦ End-of-Clock Update Cycle Flag  
♦ 14 Bytes of Clock and Control Registers  
♦ 114 Bytes of General-Purpose Battery-Backed NV  
RAM with Clear Input  
♦ Programmable Square-Wave Output  
♦ Automatic Power-Fail Detect and Switch Circuitry  
♦ +5.0V or +3.3V Operation  
monitors the status of V . If a primary power failure is  
CC  
detected, the device automatically switches to a back-  
up supply. The V  
pin supports a rechargeable  
BACKUP  
battery or a super cap and includes an integrated,  
always enabled trickle charger. The DS12R885 is  
accessed through a multiplexed byte-wide interface,  
which supports both Intel and Motorola modes. The  
DS12CR887 and DS12R887 integrate the DS12R885  
die with a crystal and battery.  
Applications  
♦ Industrial Temperature Range  
Embedded Systems  
Utility Meters  
♦ DS12CR887 Encapsulated DIP (EDIP) Module with  
Integrated Battery and Crystal  
♦ DS12R887 BGA Module Surface-Mountable  
Package with Integrated Crystal and Rechargeable  
Battery  
Security Systems  
Network Hubs, Bridges, and Routers  
Typical Operating Circuit  
Ordering Information  
PIN-  
PACKAGE  
CRYSTAL  
PART  
TEMP RANGE  
TOP MARK*  
DS12R885-5  
DS12R885-5  
DS12R885-5  
DS12R885-5  
DS12R885-33  
V
CC  
24 SO  
(300 mils)  
DS12R885S-5  
-40°C to +85°C  
X1  
AS  
X2  
V
CC  
RESET  
RCLR  
24 SO  
(300 mils)  
DS12R885S-5+ -40°C to +85°C  
R/W  
DS  
DS12R885S-5/  
-40°C to +85°C  
T&R  
24 SO  
(300 mils)  
DS83C520  
DS12R885  
CS  
DS12R885S-5+  
-40°C to +85°C  
T&R  
24 SO  
(300 mils)  
AD(0–7)  
IRQ  
SQW  
V
BACKUP  
24 SO  
(300 mils)  
SUPER  
CAP  
DS12R885S-33 -40°C to +85°C  
MOT  
GND  
+Denotes a lead-free/RoHS-compliant device.  
T&R = Tape-and-reel.  
*A “+” anywhere on the top mark indicates a lead-free device.  
Ordering Information continued at end of data sheet.  
Pin Configurations appear at end of data sheet.  
______________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
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