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参数资料
| 型号： | DS12R887 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | RTC with Constant-Voltage Trickle Charger |
| 中文描述： | 带有恒压涓流充电器的RTC |
| 文件页数： | 14/22页 |
| 文件大小： | 1093K |
| 代理商： | DS12R887 |
D
RTC with Constant-Voltage Trickle Charger
14
____________________________________________________________________
The three alarm bytes can be used in two ways. First,
when the alarm time is written in the appropriate hours,
minutes, and seconds alarm locations, the alarm inter-
rupt is initiated at the specified time each day, if the
alarm-enable bit is high. In this mode, the “0” bits in the
alarm registers and the corresponding time registers
must always be written to 0 (
Table
2A and 2B). Writing
the 0 bits in the alarm and/or time registers to 1 can
result in undefined operation.
The second use condition is to insert a “don’t care”
state in one or more of the three alarm bytes. The don’t-
care code is any hexadecimal value from C0 to FF. The
two most significant bits of each byte set the don’t-care
condition when at logic 1. An alarm is generated each
hour when the don’t-care bits are set in the hours byte.
Similarly, an alarm is generated every minute with
don’t-care codes in the hours and minute alarm bytes.
The don’t-care codes in all three alarm bytes create an
interrupt every second.
All 128 bytes can be directly written or read, except for
the following:
1) Registers C and D are read-only.
2) Bit 7 of register A is read-only.
3) The MSB of the seconds byte is read-only.
Table
2A. Time, Calendar, and Alarm Data Modes—BCD Mode (DM = 0)
ADDRESS
00H
01H
02H
03H
BIT 7
0
0
0
0
AM/PM
0
AM/PM
0
0
0
0
BIT 6
BIT 5
10 Seconds
10 Seconds
10 Minutes
10 Minutes
0
10 Hours
0
10 Hours
0
10 Date
0
10 Years
DV2
DV1
PIE
AIE
PF
AF
0
0
X
X
BIT 4
BIT 3
BIT 2
Seconds
Seconds
Minutes
Minutes
BIT 1
BIT 0
FUNCTION
Seconds
Seconds Alarm
Minutes
Minutes Alarm
RANGE
00–59
00–59
00–59
00–59
10 Hours
04H
0
Hours
Hours
1–12 +AM/PM
00–23
10 Hours
05H
0
Hours
Hours Alarm
1–12 +AM/PM
00–23
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH-7F
0
0
0
0
0
Day
Day
Date
Month
Year
Control
Control
Control
Control
RAM
01–07
01–31
01–12
00–99
—
—
—
—
—
Date
Month
Year
RS2
DM
0
0
X
10 Months
UIP
SET
IRQF
VRT
X
DV0
UIE
UF
0
X
RS3
SQWE
0
0
X
RS1
24/12
0
0
X
RS0
DSE
0
0
X
X = Read/Write Bit.
Note:
Unless otherwise specified, the state of the registers is not defined when power is first applied. Except for the seconds regis-
ter, 0 bits in the time and date registers can be written to 1, but may be modified when the clock updates. 0 bits should always be
written to 0 except for alarm mask bits.
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| DS12R887-33 | 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12R887-5 | 功能描述:实时时钟 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12T | 功能描述:DIP 开关/ SIP 开关 Raisd actutr std dip 12pos top tape seald RoHS:否 制造商:Omron Electronics 位置数量:10 开关类型:DIP 执行器:Rotary 端子节距:2.54 mm 触点形式: 端接类型:Solder Pin 电流额定值:100 mA 电压额定值 DC: 工作温度范围: 安装:Through Hole |
| DS12V | 制造商:APEM 功能描述:DIP SWITCH STD.12-WAY 制造商:APEM COMPONENTS 功能描述:DIP SWITCH STD.12-WAY |
| DS-12-V | 制造商:Diptronics Manufacturing Inc 功能描述: |
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