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参数资料
| 型号： | DS1390 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| 中文描述： | 低电压SPI/3线接口RTC，带有涓流充电器 |
| 文件页数： | 11/24页 |
| 文件大小： | 742K |
| 代理商： | DS1390 |
Detailed Description
The DS1390/DS1391/DS1392/DS1393 RTCs are low-
power clocks/calendars with alarms. Address and data
are transferred serially through a 4-wire SPI interface
for the DS1390 and DS1391 and through a 3-wire inter-
face for the DS1392 and DS1393. The clocks/calendars
provide hundredths of seconds, seconds, minutes,
hours, day, date, month, and year information. The
alarm functions are performed off all timekeeping regis-
ters, allowing the user to set high resolution alarms. The
date at the end of the month is automatically adjusted
for months with fewer than 31 days, including correc-
tions for leap year. The clocks operate in either the 24-
hour or 12-hour format with an AM/PM indicator. All four
devices have a built-in temperature-compensated volt-
age reference that detects power failures and automati-
cally switches to the battery supply. Additionally, the
devices can provide trickle charging of the backup
voltage source, with selectable charging resistance
and diode voltage drops.
Operation
The DS1390/DS1391 operate as a slave device on the
SPI serial bus. The DS1392/DS1393 operate using a
3-wire synchronous serial bus. Access is obtained by
selecting the part by the
CS
pin (CE on DS1392/
DS1393) and clocking data into/out of the part using
the SCLK and DIN/DOUT pins (I/O on DS1392/
DS1393). Multiple-byte transfers are supported within
one
CS
low period (see the
SPI Serial-Data Bus
sec-
tion). The devices are fully accessible and data can be
written and read when V
CC
is greater than V
PF
.
D
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
____________________________________________________________________
11
Functional Diagram
BUS
INTERFACE
V
CC
LEVEL DETECT,
POWER SWITCH,
WRITE PROTECT,
TRICKLE CHARGER
32,768Hz
CRYSTAL
OSCILLATOR
(DS1390/91) DIN
(DS1390/91) DOUT
(DS1392/93) I/O
X2
SCLK
V
CC
GND
V
BACKUP
X1
(DS1390/91) CS
(DS1392/93) (CE)
SQUARE-WAVE RATE
SELECTOR, INT, MUX,
RST OUTPUT
HUNDREDTHS-OF-
SECONDS
GENERATOR
REAL-TIME CLOCK
WITH HUNDREDTHS
OF SECONDS
TRICKLE REGISTER
SQW/INT (DS1390/93)
RST (DS1391/93)
SQW (DS1392)
CONTROL/STATUS
REGISTERS
ALARM REGISTERS
DS1390/DS1391/
DS1392/DS1393
相关PDF资料 |
PDF描述 |
|---|---|
| DS1392U-33 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1391U-3 | IGBT Module; Continuous Collector Current, Ic:200A; Collector Emitter Saturation Voltage, Vce(sat):3.4V; Power Dissipation, Pd:1500W; Collector Current:200A; Collector Emitter Voltage, Vceo:1.2kV; Leaded Process Compatible:No RoHS Compliant: No |
| DS1391U-33 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390U-3 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
| DS1390U-33 | Low-Voltage SPI/3-Wire RTCs with Trickle Charger |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1390_07 | 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 |
| DS1390_09 | 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 |
| DS1390-DS1393 | 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 |
| DS1390U+18 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
| DS1390U+3 | 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK SERL 10USOP - Bulk |
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