IC-HT_15 Datasheet, PDF (14/45 Pages) IC-Haus GmbH – DUAL CW LASER DIODE DRIVER

iC-HT
DUAL CW LASER DIODE DRIVER
MICROCONTROLLER MODE
preliminary
Rev B1, Page 14/45
Setting pin EMC to hi configures iC-HT for microcon-
troller mode (MCU mode). EMC pin must be set us-
ing a pull-up resistor or directly short-circuited to VDD
pin. Several parameters can be configured through a
microcontroller via I²C or SPI communication. More in-
formation about the serial communication interface can
be found on page 23.
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. If the
time in configuration mode exceeds the Configuration
Mode Timeout (cf. Electrical Characteristics No. E02),
both channels will be switched off. More information
on page 34.
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.
ADCC1(2:0)
Addr. 0x10; bit 7:5
0xx
Disabled
100
V(MDA1), ADSNF1 = 0
100
V(PLR1), ADSNF1 = 1
101
V(VB)
110
V(VDD)
111
V(LDK1)
R/W 000
Table 8: ADC channel 1 source selection
ADCC2(2:0)
Addr. 0x15; bit 7:5
0xx
Disabled
100
V(MDA2), ADSNF2 = 0
100
V(PLR2), ADSNF2 = 1
101
V(VB)
110
V(VDD)
111
V(LDK2)
R/W 000
Table 9: ADC channel 2 source selection
DISC1
0
1
DISC2
0
1
Addr. 0x10; bit 3
Channel 1 can be enabled by pin EC1
Channel 1 cannot be enabled by pin EC1
R/W 1
Table 6: Disable channel 1
Addr. 0x15; bit 3
Channel 2 can be enabled by pin EC2
Channel 2 cannot be enabled by pin EC2
R/W 1
Table 7: Disable channel 2
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.
Different voltages can be measured using a 10 bit A/D
converter with two resolutions. The following internal
voltages can be measured:
• 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
The register bits ADCCx select the signal measured
with the 10 bit A/D converter.
ADSNF1
0
1
Addr. 0x1A; bit 2
ADC measurement pin MDA1 (force)
ADC measurement PLR1 (sense)
R/W 0
Table 10: ADC channel 1 sense/force selection
ADSNF2
0
1
Addr. 0x1A; bit 6
ADC measurement pin MDA2 (force)
ADC measurement PLR2 (sense)
R/W 0
Table 11: ADC channel 2 sense/force selection