ds1682st-r Maxim Integrated Products, Inc., ds1682st-r Datasheet - Page 2

• Manufacturer Part Number: ds1682st-r
• Description: Ds1682 Total-elapsed-time Recorder With Alarm
• Manufacturer: Maxim Integrated Products, Inc.

Figure 1. DS1682 Block Diagram
PIN DESCRIPTION
PIN
2, 7
1
3
4
5
6
8
ALARM
EVENT
SDA
NAME
SCL
EVENT
ALARM
V
GND
SDA
N.C.
SCL
V
CC
CC
Semiconductor
Event Input. The EVENT pin is the input the DS1682 monitors to determine when
an event occurs. When the pin is pulled high, the contents of the EEPROM are
transferred to the ETC and the oscillator starts. The ETC begins to count in quarter-
second increments. When the EVENT pin falls to logic 0, the event counter
increments, and the event counter, ETC, and user-memory data are stored in the
EEPROM array. When the EVENT pin changes states, the 2-wire bus is
unavailable for communications for t
is also deglitched (t
No Connect. This pin is not connected internally.
Active-Low Alarm Output. The DS1682 monitors the values in the ETC for the
programmed value in the alarm register. When the ETC matches the alarm value,
the alarm flag (AF) is set. Once set, the alarm flag cannot be reset. See the
operating descriptions for the AOS and AP bits for details about the operation of
the ALARM pin.
Ground
2-Wire Serial-Clock Input. The SCL pin is the serial-clock input for the 2-wire
synchronous communications channel. The SCL pin is an input that requires an
external pullup resistor.
2-Wire Input/Output. The SDA pin is the data input/output signal for the 2-wire
synchronous communications channel. The SDA pin is an open-drain I/O, which
requires an external pullup resistor.
+2.5V to +5.5V Input Supply
OSCILLATOR
CONTROL
GLITCH
FILTER
EVENT
LOGIC
DIVIDER
DS1682
AND
Dallas
AND
G
) to prevent short noise spikes from triggering an event.
USER, CONTROL, AND
COMPARE LOGIC
EVENT COUNTER
CONFIGURATION
COUNTER (ETC)
ELAPSED TIME
ALARM REGS
INTERFACE
REGISTERS
SERIAL
2 of 14
AND
FUNCTION
EW
(falling) and t
ER
(rising). The EVENT input
EEPROM ARRAY