Rainbow Electronics DS1624 - Manual (Page 2)

DS1624
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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.
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 E
2
memory, and 2) a direct–to–digital temperature sensor.
The nonvolatile memory is made up of 256 bytes of E
2
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
STATUS REGISTER &
CONTROL LOGIC
TEMPERATURE SENSOR
EEPROM MEMORY (256 BYTES)
ADDRESS
AND
I/O CONTROL
V
DD
SCL
SDA
A1
A2
A0
GND