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RV-3049 数据表(PDF) 39 Page - MICORO CRYSTAL SWITZERLAND

部件名 RV-3049
功能描述  DTCXO Temperature Compensated Real Time Clock
PDF  65 Pages
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制造商  MICROCRYSTAL [MICORO CRYSTAL SWITZERLAND]
网页  http://www.microcrystal.com
标志 MICROCRYSTAL - MICORO CRYSTAL SWITZERLAND

RV-3049 数据表(HTML) 39 Page - MICORO CRYSTAL SWITZERLAND

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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).
Register EEPROM Control Thermometer Control (address 30h…bits description)
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
1
ThE
0
Disable Thermometer
1
Enable Thermometer
0
ThP
0
Thermometer scanning interval: 1 second
1
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
64
32
16
8
4
2
1
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
0
0
0
0
0
0
0
0
-59°C
01h
0
0
0
0
0
0
0
1
0°C
3Ch
0
0
1
1
1
1
0
0
194°C
FEh
1
1
1
1
1
1
1
0
195°C
FFh
1
1
1
1
1
1
1
1



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