IC-HT datasheet(14/45 Pages) ICHAUS

14 / 45 page

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iC-HT

DUAL CW LASER DIODE DRIVER

Rev B1, Page 14/45

MICROCONTROLLER MODE

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

disabled.

DISC1

Addr. 0x10; bit 3

R/W 1

Channel 1 can be enabled by pin EC1

Channel 1 cannot be enabled by pin EC1

Table 6: Disable channel 1

DISC2

Addr. 0x15; bit 3

R/W 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:

• 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.

ADCC1(2:0)

Addr. 0x10; bit 7:5

R/W 000

0xx

Disabled

100

V(MDA1), ADSNF1 = 0

100

V(PLR1), ADSNF1 = 1

101

V(VB)

110

V(VDD)

111

V(LDK1)

Table 8: ADC channel 1 source selection

ADCC2(2:0)

Addr. 0x15; bit 7:5

R/W 000

0xx

Disabled

100

V(MDA2), ADSNF2 = 0

100

V(PLR2), ADSNF2 = 1

101

V(VB)

110

V(VDD)

111

V(LDK2)

Table 9: ADC channel 2 source selection

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.

ADSNF1

Addr. 0x1A; bit 2

R/W 0

ADC measurement pin MDA1 (force)

ADC measurement PLR1 (sense)

Table 10: ADC channel 1 sense/force selection

ADSNF2

Addr. 0x1A; bit 6

R/W 0

ADC measurement pin MDA2 (force)

ADC measurement PLR2 (sense)

Table 11: ADC channel 2 sense/force selection

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