IC-HTP datasheet(17/51 Pages) ICHAUS

17 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 17/51

ACC mode

In this mode, the laser diode current is controlled and

no monitor diode is required. ACC mode is selected

setting EACCx register bit to 1. Figure 7 shows an

example of this configuration.

EACC1

Addr. 0x10; bit 0

R/W 0

APC mode enabled for channel 1 (light power

regulation)

ACC mode enabled for channel 1 (laser current

regulation)

Table 22: Enable APC/ACC channel 1

EACC2

Addr. 0x15; bit 0

R/W 0

APC mode enabled for channel 2 (light power

regulation)

ACC mode enabled for channel 2 (laser current

regulation)

Table 23: Enable APC/ACC channel 2

10 Bit

Signal Level Converter

255

10 Bit

ACC

8 Bit

APC

..10 nF..

ADMDK1

8 Bit

LASER CHANNEL 1

I LDA1

CI1

ECIE1

DCO

LDA1

OVC

CIH1

VBL1

ADFNS1

LDA1

VBL1

VDD

EMC

DISP1

MDK1

MRH1

CI1

I LDA1

Figure 7: ACC mode simplified

In ACC mode an internal resistor (RACCx) is used in-

stead of the internal programmable logarithmic monitor

resistor (PLR). Different current ranges can be selected

though register bits RACCx and CRNGx(1:0).

RACC1

Addr. 0x1A; bit 0

R/W 0

Current range high for channel 1, Current sensor

resistor (Rsensex) set to 2kΩ

Current range low for channel 1, Current sensor

resistor (Rsensex) set to 16kΩ

Table 24: Current range configuration channel 1

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 25: Current range configuration channel 2

CRNG1(1:0)

Addr. 0x1E; bit 1:0

R/W 00

Output current range from 0 to 750 mA, RACC1 = 0,

k factor set to 750/750 = 1

Output current range from 0 to 100 mA, RACC1 = 0,

k factor set to 100/750,= 0.13

Output current range from 0 to 25 mA, RACC1 = 0, k

factor set to 25/750 = 0.03

Output current range from 0 to 9 mA, RACC1 = 0, k

factor set to 9/750 = 0.012

Output current range from 0 to 90 mA, RACC1 = 1, k

factor set to 750/750 = 1

Output current range from 0 to 12 mA, RACC1 = 1, k

factor set to 100/750 = 0.13

Output current range from 0 to 3 mA, RACC1 = 1, k

factor set to 25/750 = 0.03

Output current range from 0 to 1.1 mA, RACC1 = 1, k

factor set to 9/750 = 0.012

Table 26: Current range channel 1

CRNG2(1:0)

Addr. 0x1E; bit 5:4

R/W 00

Output current range from 0 to 750 mA, RACC2 = 0,

k factor set to 750/750 = 1

Output current range from 0 to 100 mA, RACC2 = 0,

k factor set to 100/750,= 0.13

Output current range from 0 to 25 mA, RACC2 = 0, k

factor set to 25/750 = 0.03

Output current range from 0 to 9 mA, RACC2 = 0, k

factor set to 9/750 = 0.012

Output current range from 0 to 90 mA, RACC2 = 1, k

factor set to 750/750 = 1

Output current range from 0 to 12 mA, RACC2 = 1, k

factor set to 100/750 = 0.13

Output current range from 0 to 3 mA, RACC2 = 1, k

factor set to 25/750 = 0.03

Output current range from 0 to 1.1 mA, RACC2 = 1, k

factor set to 9/750 = 0.012

Table 27: Current range channel 2

Table 28 shows a list with all selectable current ranges.

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