IC-HTP Datasheet, PDF (17/51 Pages) IC-Haus GmbH – DUAL CW P-TYPE LASER DIODE DRIVER

iC-HTP
DUAL CW P-TYPE
LASER
DIODE
DRIVER
preliminary
ACC mode
Rev B1, Page 17/51
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.
RACC2
0
1
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
EACC1
0
1
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
0
1
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
D
A
8 Bit
D
A
+
-
CI
OVC
DCO
ECIE1
VBL1
CIH1
CI1
LDA1
ACC
VDD
MRH1
VB
CI1
..10 nF..
I LDA1
EM C
8 Bit
DISP1
R
0
255
10 Bit
A
D
LDA1
VBL1
VB
A DM DK 1
LASER CHANNEL 1 ^ADFNS1
x1
x2
Signal Level Converter
APC
MDK1
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
0
1
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 25: Current range configuration channel 2
CRNG1(1:0)
Addr. 0x1E; bit 1:0
R/W 00
00
Output current range from 0 to 750 mA, RACC1 = 0,
k factor set to 750/750 = 1
01
Output current range from 0 to 100 mA, RACC1 = 0,
k factor set to 100/750,= 0.13
10
Output current range from 0 to 25 mA, RACC1 = 0, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 9 mA, RACC1 = 0, k
factor set to 9/750 = 0.012
00
Output current range from 0 to 90 mA, RACC1 = 1, k
factor set to 750/750 = 1
01
Output current range from 0 to 12 mA, RACC1 = 1, k
factor set to 100/750 = 0.13
10
Output current range from 0 to 3 mA, RACC1 = 1, k
factor set to 25/750 = 0.03
11
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
00
Output current range from 0 to 750 mA, RACC2 = 0,
k factor set to 750/750 = 1
01
Output current range from 0 to 100 mA, RACC2 = 0,
k factor set to 100/750,= 0.13
10
Output current range from 0 to 25 mA, RACC2 = 0, k
factor set to 25/750 = 0.03
11
Output current range from 0 to 9 mA, RACC2 = 0, k
factor set to 9/750 = 0.012
00
Output current range from 0 to 90 mA, RACC2 = 1, k
factor set to 750/750 = 1
01
Output current range from 0 to 12 mA, RACC2 = 1, k
factor set to 100/750 = 0.13
10
Output current range from 0 to 3 mA, RACC2 = 1, k
factor set to 25/750 = 0.03
11
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 24: Current range configuration channel 1
Table 28 shows a list with all selectable current ranges.