RV-3049 datasheet(39/65 Pages) MICROCRYSTAL

39 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

39/65

5.2.1.THERMOMETER AND TEMPERATURE VALUE

The function of the Thermometer is controlled by “ThP” and “ThE” (bit 0 & bit 1 in the register EEPROM Control).

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

30h

EEPROM Control

R80k

R20k

R5k

R1k

FD1

FD0

ThE

ThP

Bit

Symbol

Value

Description

ThE

Disable Thermometer

Enable Thermometer

ThP

Thermometer scanning interval: 1 second

Thermometer scanning interval: 16 seconds

The measured temperature value is stored in the register “Temperature” at address 20h.

The measured temperature is binary coded ranging from -60°C (=0d) to +190°C (=250d).

Example: Temperature of 0°C corresponding to a content of = 60d.

The thermometer has a resolution of 1°C per LSB; the typical accuracy is +/-4°C within the temperature range

-40°C to +125°C. The Thermometer is automatically disabled if status bit “Vlow1” is set = “1”, the result of the last

temperature measurement is frozen in register “Temperature” and the frequency compensation continues working

with this last temperature reading.

The actual temperature value can be read from register “Temperature” at address 20h. The Thermometer has to be

disabled by ThE = “0” to externally write a temperature value into the register “Temperature” at address 20h.

Temperature Value (address 20h…bits description)

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

20h

Temperature

128

These bits hold the Temperature Value coded in binary format

Temperature

Value hex

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

-60°C

00h

-59°C

01h

0°C

3Ch

194°C

FEh

195°C

FFh

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