IC-HTP datasheet(13/51 Pages) ICHAUS

13 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 13/51

MICROCONTROLLER MODE

Setting pin EMC to hi configures iC-HTP 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

information about the serial communication interface

can be found on page 26.

The configuration of the internal parameters of iC-HTP

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-HTP. Once the configuration is considered as valid,

iC-HTP can be switched to operation mode. These two

modes are configured by the MODE register. The time

elapsed in configuration may not exceed 40 ms. If this

timeout is exceeded, both channels will be switched off.

More information on page 38.

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.

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(LDAx) up to 11 V with 11.81 mV resolution

• V(VDD) up to 8 V with 8.6 mV resolution

• V(VB) up to 11 V with 11.81 mV resolution

• V(VBLx) up to 11 V with 11.81 mV resolution

• V(MDKx) up to 1.1 V with 1.075 mV resolution

• V(PLRx) up to 1.1 V with 1.075 mV resolution

• V(RACC) up to 1.1 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

Channel 1 ADC disabled

100

Channel 1 ADC sourced by V(MDK1), ADFNS1 = 1,

CMES1 = 0

100

Channel 1 ADC sourced by V(PLR1), ADFNS1 = 0,

CMES1 = 0

100

Channel 1 ADC sourced by ACC current sensor,

CMES1 = 1

101

Channel 1 ADC sourced by V(VB)

110

Channel 1 ADC sourced by V(VBL1)

111

Channel 1 ADC sourced by V(LDA1)

Table 8: ADC channel 1 source selection

ADCC2(2:0)

Addr. 0x15; bit 7:5

R/W 000

0xx

Channel 2 ADC disabled

100

Channel 2 ADC sourced by V(MDK2), ADFNS2 = 1,

CMES2 = 0

100

Channel 2 ADC sourced by V(PLR2), ADFNS2 = 0,

CMES2 = 0

100

Channel 2 ADC sourced by ACC current sensor,

CMES2 = 1

101

Channel 2 ADC sourced by V(VDD)

110

Channel 2 ADC sourced by V(VBL2)

111

Channel 2 ADC sourced by V(LDA2)

Table 9: ADC channel 2 source selection

With ADCCx(2:0) = 100, the signal to the A/D converter

is selected by register bit ADFNSx. With ADFNSx = 0

the measuring point to the A/D converter is the internal

sense node of the internal programmable logarithmic

monitor resistor (PLR). With ADFNSx = 1 the sensing

point is connected directly to MDKx pin. Note that in this

case, only voltages from 0 to 1.1 V can be monitored for

the A/D converter. With the CMESx bit, the ADC can be

used for laser current measurement in ACC mode. For

this measurement, ADCCx register must be set to 100.

As shown in figure 7, a fraction of the current delivered

by the driver to the laser is mirrored to a resistor. The

voltage drop at this resistor is sourced to the ADC. For a

more detailed explanation of the current measurement,

please refer to the ADC chapter.

ADFNS1

Addr. 0x1A; bit 2

R/W 0

ADC measurement PLR1 after level shifting (sense)

ADC measurement MDK1 pad (force)

Table 10: ADC channel 1 force/sense selection

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