IC-HTP datasheet(31/51 Pages) ICHAUS

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 31/51

RACC2

Addr. 0x1A; bit 4

R/W 0

Current range high for channel 2, Current sensor

resistor (Rsensex) set to 2kΩ

Current range low for channel 2, Current sensor

resistor (Rsensex) set to 16kΩ

Table 69: Current range configuration channel 2

Since all of the above values are typical, a first cali-

bration measurement is recommended to calculate the

offset of each device.

When enabled, the A/D converter is continuously ac-

quiring the signal selected by ADCCx register. The

conversion time, is 140 µs. Changing the source re-

quires 500 µs settling time.

In order to do a measurement, register ADCx must be

read. The converter does not provide an end of conver-

sion (EOC) bit. Instead, ADCx register contains always

the value of the last conversion.

As the A/D converter is 10 bit long, the results are split

into two byte wide separated registers; ADCxh con-

tains channel x ADC MSBs values while ADCxl stores

the LSBs. A consecutive read action of both registers

(lower and upper part) should be carried out in order

to prevent an undesired change in the measured value

between two read actions.

ADC1

Addr. 0x03/04; bit 9:0

0x000

ADC minimum value

0x3FF

ADC maximum value

Table 70: ADC channel 1

ADC2

Addr. 0x05/06; bit 9:0

0x000

ADC minimum value

0x3FF

ADC maximum value

Table 71: ADC channel 2

The voltage corresponding to the measured digital

value can be directly obtained through the following

formula:

V(LDAx, VB, VBLx) = 11 ∗ VFS

1023 ∗ ADCx

V(VDD) = 8 ∗ VFS

1023 ∗ ADCx

V(MDKx, PLRx) = VFS

1023 ∗ ADCx

VFS is the full scale voltage of the A/D converter (cf.

Electrical Characteristics No. 706) typical 1.1 V. For

a more precise measurement, the A/D converter can

be calibrated by measuring a known VB voltage and

calculate the VFS.

If ADFNSx = 1 the sensing point is connected directly

to MDKx pin. Depending on the regulation voltage, it

is possible that V(MDKx) is higher than 1.1 V. When

MDKx pin is the source of the A/D converter, saturation

of the converter will occur. When monitoring pin MDKx

with the A/D converter, V(MDKx) must be lower than

1.1 V.

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