IC-HTP datasheet(23/51 Pages) ICHAUS

23 / 51 page

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iC-HTP

DUAL CW P-TYPE LASER DIODE DRIVER

Rev B1, Page 23/51

COMBINING BOTH CHANNELS

iC-HTP can drive one laser diode up to 1500 mA with

both channels combined. Therefor register bit MERGE

must be set to 1. Disable channel register bits DISC1

and DISC2 must both be set to 0 and both enable chan-

nel pins EC1 and EC2 must be set hi.

MERGE

Addr. 0x1B; bit 6

R/W 0

Channel 1 and 2 operate independently

Power transistor from channel 2 usable in parallel

with channel 1, regulation made by channel 1

Table 47: Channel combination

Different current ranges can be configured using

CRNG1 and CRNG2. The resulting range is the addi-

tion of both configured ranges.

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 48: 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 49: Current range channel 2

In ACC mode, only RACC1 modifies the current range

and for both channels the same.

Current ranges in merge mode for ACC

RACC1 CRNG1 CRNG2 Current Range

1500 mA

850 mA

775 mA

759 mA

850 mA

...

180 mA

102 mA

93 mA

91.1 mA

102 mA

...

Table 50: Merge mode current ranges

When both channels are combined the control is done

by channel 1. APC and ACC can both be used with

both channels combined.

In ACC mode, the reference needs to be configured

according to the selected current range (if both CRNG1

and CRNG2 are the same, set to 50% of the equiva-

lent value for a single channel operation). This is not

required for APC.

Both VBL1 and VBL2 must be connected to the same

voltage level. If voltages at VBL1 and VBL2 are dif-

ferent, PODOVBL1 bit in status register will be set

and laser will be shut down. In merge mode, the

PODOVBL2 bit is used to monitor both VBL1 and VBL2

voltages for power down. If any of the VBL1 or VBL2

are in power down, this bit will be set.

PDOVBL1

Addr. 0x01; bit 3

VBL1 power down not occurred since last read. If

MERGE = 1, VBL1 voltage level equals VBL2

voltage level

VBL1 power down event has occurred. If MERGE =

1, VBL1 voltage level not equals VBL2 voltage level.

Cleared on read

Table 51: VBL1 power down

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