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What is DS1673?

This electronic component, produced by the manufacturer "Dallas Semiconductor", performs the same function as "Portable System Controller".


DS1673 Datasheet PDF - Dallas Semiconductor

Part Number DS1673
Description Portable System Controller
Manufacturers Dallas Semiconductor 
Logo Dallas Semiconductor Logo 


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DS1673
Portable System Controller
FEATURES
Provides 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
– Power control circuitry supports system
power on from day/time alarm
Microprocessor monitor:
– Halts microprocessor during power-fail
– Automatically restarts microprocessor
after power failure
– Monitors pushbutton for external override
– Halts and resets an out of control
microprocessor
NV RAM control:
– Automatic battery backup and write
protection to external SRAM
3-channel, 8-bit analog-to-digital converter
Simple 3-wire interface
+3.0 or +5.0V operation
PIN ASSIGNMENT
VBAT
VCCO
SCLK
I/O
CS
CEI
CEOL
CEOH
INT
GND
1
2
3
4
5
6
7
8
9
10
20 ST
19 VCC
18 X1
17 X2
16 AIN0
15 AIN1
14 AIN2
13 RST
12 BLE
11 BHE
20-Pin TSSOP
20-Pin SOIC
ORDERING INFORMATION
DS1673E - X
20-Pin TSSOP
DS1673S - X
20-Pin SOIC
3 +3V operation
5 +5V operation
DESCRIPTION
The Portable System Controller is a circuit which incorporates many of the functions necessary for low
power portable products integrated into one chip. The DS1673 provides a Real Time Clock, NV RAM
controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter. Communication
with the DS1673 is established through a simple 3-wire interface.
The Real Time Clock (RTC) provides seconds, minutes, hours, day, date, month, and year information
with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the
DS1673 is powered by the system power supply or when in battery backup operation so the alarm can be
used to wake up a system that is powered down.
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DS1673 equivalent
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DS1673 ADDRESS MAP Figure 3
DS1673
CLOCK, CALENDAR AND ALARM
The time and calendar information is accessed by reading/writing the appropriate register bytes. Note
that some bits are set to 0. These bits will always read 0 regardless of how they are written. Also note
that registers 0Fh to 7Fh are reserved. These registers will always read 0 regardless of how they are
written. The contents of the time, calendar, and alarm registers are in the Binary-Coded Decimal (BCD)
format. The DS1673 can run in either 12-hour or 24-hour mode. Bit 6 of the hours register is defined as
the 12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5
is the AM/PM bit with logic 1 being PM. In the 24-hour mode, bit 5 is the second 10-hour bit (20-23
hours).
The DS1673 also contains a time of day alarm. The alarm registers are located in registers 07h to 0Ah.
Bit 7 of each of the alarm registers are mask bits (see Table 1). When all of the mask bits are logic 0, an
alarm will occur once per week when the values stored in timekeeping registers 00h to 03h match the
values stored in the time of day alarm registers. An alarm will be generated every day when mask bit of
the day alarm register is set to 1. An alarm will be generated every hour when the day and hour alarm
mask bits are set to 1. Similarly, an alarm will be generated every minute when the day, hour, and minute
alarm mask bits are set to 1. When day, hour, minute, and seconds alarm mask bits are set to 1, an alarm
will occur every second.
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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DS1673 electronic component.


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