Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 56)

DS4830 User’s Guide
56
7.2.6 – Temperature Control Register (TEMPCN)
Register Address: M2 [0Bh]
The Temperature Control register TEMPCN configures and enables internal die temperature and two external remote
diodes temperatures. Internal Temperature, external diode 0 and external diode 1 temperatures have dedicated data
buffers 22, 21 and 20 respectively. The DS4830 ADC Controller forces current in the diode and integrates voltage across
diode. After integration the ADC Controller measured voltage on ADC and convert measured voltage in temperature.
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name - - - - - INT_IEN EX0_iEN EX1_iEN - EX1_ALIGN EX0_ALIGN INT_ALIGN - EX1_TEMP EX0_TEMP INT_TEMP
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Access r r r r r rw rw rw rw rw rw rw rw rw rw rw
BIT NAME DESCRIPTION
15:11 - Reserved. The user should write 0 to these bits.
10 INT_IEN Internal Temperature Interrupt Enable: Setting this bit to ‘1’ will enable an interrupt generation
on completion of an internal temperature conversion.
9 EX0_IEN External Diode 0 Temperature Interrupt Enable: Setting this bit to ‘1’ will enable an interrupt
generation on completion of an external diode 0 temperature conversion.
8 EX1_IEN External Diode 1 Temperature Interrupt Enable: Setting this bit to ‘1’ will enable an interrupt
generation on completion of an external diode 1 temperature conversion.
7 - Reserved. The user should write 0 to this bit.
6 EX1_ALIGN External Diode 1 Temperature Data Align. Setting this bit to ‘1’ configures external diode 1
temperature conversion data in left aligned mode. Setting this bit to ‘0’ configures external diode
1 temperature conversion data in right aligned mode.
5 EX0_ALIGN External Diode 0 Temperature Data Align. Setting this bit to ‘1’ configures external diode 0
temperature conversion data in left aligned mode. Setting this bit to ‘0’ configures external diode
0 temperature conversion data in right aligned mode.
4 INT_ALIGN Internal Temperature Data Align. Setting this bit to ‘1’ configures internal temperature
conversion data in left align ed mode. Setting this bit to ‘0’ configures internal temperature
conversion data in right aligned mode.
3 - Reserved. The user should write 0 to this bit.
2 EX1_TEMP External Diode 1 Temperature Enable. Setting this bit to ‘1’ initiates external diode 1
temperature conversion. The external diode 1 temperature typical conversion time is 4.1msec.
After external diode 1 temperature conversion result is available in data buffer 20.
1 EX0_TEMP External Diode 0 Temperature Enable. Setting this bit to ‘1’ initiates external diode 0
temperature conversion. The external diode 0 temperature typical conversion time is 4.1msec.
After external diode 0 temperature conversion result is available in data buffer 21.
0 INT_TEMP Internal Temperature Enable. Setting this bi t to ‘1’ initiates internal temperature conversion.
The internal temperature typical conversion time is 4.1msec. After internal temperature
conversion result is available in data buffer 22.
7.2.7
– External Temperature Slope Control Register (ETS)
Register Address: M1 [16h]
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Name - - - - - - - - ETS.7 ETS.6 ETS.5 ETS.4 ETS.3 ETS.2 ETS.1 ETS.0
Reset 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0
Access r r r r r r r r rw rw rw rw rw rw rw rw
The ETS register sets changes the slope of external temperature measurements to compensate for changes in diode
ideality factor. The DS4830 is factory calibrated to work with a diode connected 2N3904 NPN transistor.