DS1624 Datasheet, PDF (2/16 Pages) Dallas Semiconductor – Digital Thermometer and Memory

DETAILED PIN DESCRIPTION Table 1
PIN
SYMBOL DESCRIPTION
1
SDA
Data input/output pin for 2-wire serial communication port.
2
SCL
Clock input/output pin for 2-wire serial communication port.
3
NC
No connect. No Internal Connection.
4
GND
Ground pin.
5
A2
Address input pin.
6
A1
Address input pin.
7
A0
Address input pin.
8
V_DD
Supply Voltage 2.7V to 5.5V input power pin.
DS1624
OVERVIEW
A block diagram of the DS1624 is shown in Figure 1. The DS1624 consists of two separate functional
units: 1) a 256–byte nonvolatile E² memory, and 2) a direct–to–digital temperature sensor.
The nonvolatile memory is made up of 256 bytes of E² memory. This memory may be used to store any
type of information the user wishes; for example, frequency compensation coefficients may be placed in
this memory to allow for compensation of measured frequency depending upon the temperature at which
the measurement is made. These memory locations are accessed through the 2–wire serial bus.
The direct to digital temperature sensor allows the DS1624 to measure the ambient temperature and
report the temperature value in a 13–bit word, with 0.03125°C resolution. The temperature sensor and its
related registers are accessed through the 2–wire serial interface.
DS1624 FUNCTIONAL BLOCK DIAGRAM Figure 1
V_DD
STATUS REGISTER &
CONTROL LOGIC
SCL
ADDRESS
AND
I/O CONTROL
SDA
A0
A1
A2
GND
TEMPERATURE SENSOR
EEPROM MEMORY (256 BYTES)
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