Rainbow-electronics DS1602 Manuel d'utilisateur

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1 of 10 093002
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of an
y device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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 V
BAT
is less
than 2.5V
§ V
CC
powered counter counts seconds while
V
CC
is above V
TP
and retains the count in the
absence of V
CC
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 V
BAT
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
V
CC
= 2.5V
§ Underwriters Laboratory (UL) recognized
PIN ASSIGNMENT
Package Dimension Information
www.maxim-ic.com/TechSupport/DallasPackInfo.htm
PIN DESCRIPTION
RST - Reset
CLK - Clock
DQ - Data Input/Output
GND - Ground
X1, X2 - Crystal Inputs
V
BAT
- + Battery Input
V
CC
- +5V
DESCRIPTION
The DS1602 is a real-time clock/elapsed time counter designed to count seconds when V
CC
power is
applied and continually count seconds under battery backup power with an additional counter regardless
of the condition of V
CC
. The continuous counter can be used to derive time of day, week, month, and year
by using a software algorithm. The V
CC
powered counter will automatically record the amount of time
that V
CC
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 32.768kHz crystal attaches directly to the X1 and X2 pins. If battery powered-only operation is
desired, the V
BAT
pin must be grounded and the V
CC
pin must be connected to the battery.
DS1602
8-Pin DIP (300mil)
V
CC
V
BAT
RST
DQ
CLK
GND
1
2
3
4
8
7
6
5
DS1602
8-Pin SOIC (208mil)
RST
DQ
CLK
GND
V
CC
V
BAT
1
2
3
4
8
7
6
5
DS1602
Elapsed Time Counter
www.
maxim
-
ic
.com
www.maxim
-
ic.com
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Résumé du contenu

Page 1 - Elapsed Time Counter

1 of 10 093002 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions

Page 2 - RESET AND CLOCK CONTROL

DS1602 2 of 8 OPERATION The main elements of the DS1602 are shown in Figure 1. As shown, communications to and from the elapsed time counter occur o

Page 3 - PIN DESCRIPTIONS

DS1602 3 of 8 transfer. A clock cycle is a sequence of a rising edge followed by a falling edge. For write inputs, data must be valid during the risin

Page 4 - Figure 2. PROTOCOL BIT MAP

DS1602 4 of 8 Dallas Real-Time Clocks. The DS1602 can also be driven by an external 32.768kHz oscillator. In this configuration, the X1 pin is connect

Page 5 - Table 1. VALID PROTOCOLS

DS1602 5 of 8 Table 1. VALID PROTOCOLS PROTOCOL ACTION ACC AVC OSC2 OSC1 OSC0 CCC CVC RD FUNCTION Read Continuous Counter 1 0 X X X X X

Page 6 - Figure 3. DATA TRANSFER

DS1602 6 of 8 Figure 3. DATA TRANSFER TIMING DIAGRAM: READ/WRITE DATA TRANSFER Note: tCL, tCH, tR, and tF apply to both read and write data

Page 7

DS1602 7 of 8 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground -0.3V to +7.0V Operating Temperature Range -40°C to +85°C Storag

Page 8 - = +5V ±10%; -40°C to 85°C)

DS1602 8 of 8 AC ELECTRICAL CHARACTERISTICS (VCC = +5V ±10%; -40°C to 85°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Data to CLK Setup tD

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