DS1624

2 of 16

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

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

The nonvolatile memory is made up of 256 bytes of E

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

SCL

SDA

A1

A2

A0

GND