iC-HT
DUAL CW LASER DIODE DRIVER
Rev A1, Page 13/42
MICROCONTROLLER MODE
ADCC1(2:0)
0xx
Addr. 0x10; bit 7:5
Disabled
R/W 000
Setting pin EMC to hi configures iC-HT for microcon-
troller mode (MCU mode). Several parameters can
be configured through a microcontroller via I²C or SPI
communication. More information about the serial
communication interface can be found on page 21.
100
V(MDA1), ADSNF1 = 0
V(PLR1), ADSNF1 = 1
V(VB)
100
101
110
V(VDD)
111
V(LDK1)
The configuration of the internal parameters of iC-HT
must be done in configuration mode. In this mode, the
configuration memory can be written and read back
without changing the previous configuration state of
iC-HT. Once the configuration is considered as valid,
iC-HT can be switched to operation mode. These two
modes are configured by the MODE register. The time
elapsed in configuration must not exceed 40 ms. If this
timeout is exceeded, both channels will be switched
off. More information on page 32.
Table 8: ADC channel 1 source selection
ADCC2(2:0)
Addr. 0x15; bit 7:5
Disabled
R/W 000
0xx
100
100
101
110
111
V(MDA2), ADSNF2 = 0
V(PLR2), ADSNF2 = 1
V(VB)
Each individual channel can be enabled by setting pin
ECx to hi. Setting register bits DISCx to 1 disables
the corresponding channel. If either pin ECx is lo or
register bits DISCx is 1, the corresponding channel is
disabled.
V(VDD)
V(LDK2)
Table 9: ADC channel 2 source selection
DISC1
Addr. 0x10; bit 3
R/W 1
0
1
Channel 1 can be enabled by pin EC1
Channel 1 cannot be enabled by pin EC1
Table 6: Disable channel 1
With ADCCx(2:0) = 100, the signal to the A/D converter
is selected by register bit ADSNFx. With ADSNFx = 1
the measuring point to the A/D converter is the internal
sense node of the internal programmable logarithmic
monitor resistor (PLR). With ADSNFx = 0 the sensing
point is connected directly to MDAx pin.
DISC2
Addr. 0x15; bit 3
R/W 1
0
1
Channel 2 can be enabled by pin EC2
Channel 2 cannot be enabled by pin EC2
Table 7: Disable channel 2
Different voltages can be measured using a 10 bit A/D
converter with two resolutions. The following internal
voltages can be measured:
ADSNF1
Addr. 0x1A; bit 2
R/W 0
0
1
ADC measurement pin MDA1 (force)
ADC measurement PLR1 (sense)
• V(LDKx) up to 8 V with 8.6 mV resolution
• V(VDD) up to 8 V with 8.6 mV resolution
• V(VB) up to 8 V with 8.6 mV resolution
• V(MDAx) up to 1 V with 1.075 mV resolution
• V(PLRx) up to 1 V with 1.075 mV resolution
Table 10: ADC channel 1 sense/force selection
ADSNF2
Addr. 0x1A; bit 6
R/W 0
0
1
ADC measurement pin MDA2 (force)
ADC measurement PLR2 (sense)
The register bits ADCCx select the signal measured
with the 10 bit A/D converter.
Table 11: ADC channel 2 sense/force selection
ICHAUS [ IC-HAUS GMBH ]
