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参数资料
| 型号： | DS1390U-3+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/26页 |
| 文件大小： | 0K |
| 描述： | IC RTC SPI 3WIRE W/CHRGR 10-MSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 3,000 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，涓流充电器 |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | SPI |
| 电源电压： | 2.7 V ~ 3.3 V |
| 电压 - 电源，电池： | 1.3 V ~ 3.7 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
14
Maxim Integrated
Address Map
Table 3 shows the address map for the DS1390–
DS1393 RTC and RAM registers. The RTC registers are
located in address locations 00h to 0Fh in read mode,
and 80h to 8Fh in write mode. During a multibyte
access, when the address pointer reaches 0Fh, it
wraps around to location 00h. On the falling edge of the
CS pin (DS1390/DS1391/DS1394) or the rising edge of
CE (DS1392/DS1393), the current time is transferred to
a second set of registers. The time information is read
from these secondary registers, while the clock may
continue to run. This eliminates the need to re-read the
registers if the main registers update during a read. To
avoid rollover issues when writing to the time and date
registers, all registers should be written before the hun-
dredths-of-seconds registers reaches 99 (BCD).
When reading from the hundredths of seconds register,
there is a possibility that the data transfer happens at the
same time as an increment of the register. If this occurs,
the data in the buffer may be incorrect. The chances of
this happening is approximately 170ppb. There are two
ways to deal with this.
The first method is to synchronize enabling the device
(CE or CS) with the square wave or interrupt output
(DS1390–DS1394). Enabling the device, either after
detecting the falling edge of the interrupt output or the
rising edge of the square-wave output, ensures that the
two events are not simultaneous.
The second method is to read the hundredths of sec-
onds register until the data for two consecutive reads
match. With this method, the master must be able to
read the register at least twice within the 10ms update
period of the hundredths of seconds register.
Either of the described methods ensures that the data in
all the registers is correct. If the hundredths of seconds
register is not used, it is also possible for the same prob-
lem to occur when reading the seconds register. The
probability of an error is inversely proportional to the rate
of the register's update frequency in relation to the hun-
dredth of seconds register, so the error rate for the sec-
onds register would be approximately 1.7ppb. The same
methods used for the hundredth of seconds register
would be used for the seconds register.
WRITE
ADDRESS
READ
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FUNCTION
RANGE
80h
00h
Tenths of Seconds
Hundredths of Seconds
Hundredths
of Seconds
0–99 BCD
81h
01h
0
10 Seconds
Seconds
00–59 BCD
82h
02h
0
10 Minutes
Minutes
00–59 BCD
AM/PM
83h
03h
0
12/
24
10 Hour
10
Hour
Hours
1–12 +AM/PM
00–23 BCD
84h
04h
0
Day
1–7 BCD
85h
05h
0
10 Date
Date
01–31 BCD
86h
06h
Century
0
10
Month
Month/
Century
01–12 +
Century BCD
87h
07h
10 Year
Year
00–99 BCD
88h
08h
Tenths of Seconds
Hundredths of Seconds
Alarm
Hundredths
of Seconds
0–99 BCD
89h
09h
AM1
10 Seconds
Seconds
Alarm
00–59 BCD
8Ah
0Ah
AM2
10 Minutes
Minutes
Alarm
00–59 BCD
Table 3. Address Map
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1391 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1391U+18 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
| DS1391U+3 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
| DS1391U+33 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
| DS1391U-18 | 功能描述:实时时钟 Low-V SPI/3-Wire With 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 |
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