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PDF DS1602 Data sheet ( Hoja de datos )
| Número de pieza | DS1602 | |
| Descripción | Elapsed Time Counter | |
| Fabricantes | Dallas | |
| Logotipo |  |
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FEATURES
§ Two 32–bit counters keep track of real time
and elapsed time
§ Counters keep track of seconds for over 125
years
§ Battery powered counter counts seconds from
the time battery is attached until VBAT is less
than 2.5 volts
§ VCC powered counter counts seconds while
VCC is above 4.25 volts and retains the count
in the absence of VCC under battery backup
power
§ Clear function resets selected counter to 0
§ Read/Write serial port affords low pin count
§ Maximum current drain of less than 1 µA
from VBAT pin when serial port is disabled
§ One byte protocol defines read/write, counter
address and software clear function
§ 8–pin DIP or optional 8–pin SOIC
§ Operating temperature range of –40°C to
+85°C
§ Reduced performance operation down to VCC
= 2.5V
DS1602
Elapsed Time Counter
PIN ASSIGNMENT
RST 1
DQ 2
8 VCC
7 X1
CLK 3
6 X2
GND 4
5 VBAT
DS1602
8-Pin DIP (300-mil)
RST 1
DQ 2
8 VCC
7 X1
CLK 3 6 X2
GND 4
5 VBAT
DS1602
8-Pin SOIC (200-mil)
PIN DESCRIPTION
RST
CLK
DQ
GND
X1, X2
VBAT
VCC
- Reset
- Clock
- Data Input/Output
- Ground
- Crystal Inputs
- + Battery Input
- +5 Volts
DESCRIPTION
The DS1602 is a real time clock/elapsed time counter designed to count seconds when VCC power is
applied and continually count seconds under battery backup power with an additional counter regardless
of the condition of VCC. The continuous counter can be used to derive time of day, week, month, and year
by using a software algorithm. The VCC powered counter will automatically record the amount of time
that VCC power is applied. This function is particularly useful in determining the operational time of
equipment in which the DS1602 is used. Alternatively, this counter can also be used under software
control to record real time events. Communication to and from the DS1602 takes place via a 3–wire
serial port. A 1-byte protocol selects read/ write functions, counter clear functions and oscillator trim. A
low cost 32.768 kHz crystal attaches directly to the X1 and X2 pins. If battery powered-only operation is
desired, the VBAT pin must be grounded and the VCC pin must be connected to the battery.
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1 page  
DS1602
VALID PROTOCOLS Table 1
ACTION
PROTOCOL
ACC AVC OSC2 OSC1 OSC0 CCC CVC RD DESCRIPTION
Read
1 0 X X X X X 1 Output continuous
Continuous
counter on the 32 clocks
Counter
following protocol.
Oscillator trim register
is not updated.
Counters are not reset.
Write
1 0 X X X X X 0 Input data to continuous
Continuous
counter on the 32 clocks
Counter
following protocol.
Oscillator trim register
is not updated.
Counters are not reset.
Read VCC
Active
0 1 X X X X X 1 Output VCC active
counter on the 32 clocks
Counter
following protocol,
oscillator trim register
is not updated.
Counters are not reset.
Write VCC
Active
01 X
X X X X 0 Input data to continuous
counter on the 32 clocks
Counter
following protocol.
Oscillator trim register
is not updated.
Counters are not reset.
Clear
0 0 X X X 1 X X Resets the continuous
Continuous
counter to all zeroes at
Counter
the end of protocol.
Oscillator trim register
is not updated.
Clear VCC
Active
0 0 X X X X 1 X Resets the VCC active
counter to all zeroes at
Counter
the end of protocol.
Oscillator trim register
is not updated.
Set Oscillator 1
1
A
B C X X 0 Sets the oscillator trim
Trim Bits
register to a value of
ABC. Counters are
unaffected.
X = Don’t Care
5 of 10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS1602.PDF ] | |
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