AK2571 Datasheet, PDF (17/52 Pages) Asahi Kasei Microsystems – Single-Chip Automatic Power/Temperature Control for WDM Laser Diodes

AKM Confidential
AK2571
4.3 TEC control
The TEC control process is illustrated in table 4-4. Figures 4-3 to 4-6 explain the circuit that drives TEC and table 4-5
indicate the pin strapping for different control modes.
Figure 4-3 PWM control
Figure 4-5 Analog control 2-1
AK2571
HEATP
TEC
COOLP
PID
PWM
COOLN
HEATN
AK2571
HEATP
COOLP
Curreny
PID
direction
TEC
control _COOLN
HEATN
I-DAC4
IOUT4
IOUT4B
Figure 4-4 Analog control-1
Figure 4-6 Analog control 2-2
AK2571
HEATP
TEC
COOLP
Current
PID
direction
control _COOLN
AK2571
HEATP
HEATN
COOLP
Currnt
PID
direction
TEC
control _COOLN
I-DAC4C
I-DAC4H
IOUT4C
IOUT4H
Current
amp
I-DAC4C
I-DAC4H
HEATN
IOUT4C
IOUT4H
Table 4-5 pin status
PID data TEC
PID=0 OFF
PID>0 Heating
PID<0 Cooling
Control way
PWM
Analog-1
Analog-2
PWM
Analog-1
Analog-2
PWM
Analog-1
Analog-2
IOUT4H
GND
GND
GND
GND
Current out
Current out
GND
Current out
GND
IOUT4C HEAT_P HEAT_N
GND
1
0
GND
1
0
GND
1
0
GND
0
PWM
GND
0
1
GND
0
0
GND
1
0
GND
1
0
Current out 1
0
COOL_P
1
1
1
1
1
1
0
0
0
COOL_N
0
0
0
0
0
0
PWM
1
0
<Rev. 0.6E Preliminary>
-17-
2001/11