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
PID
PWM
TEC
HEATP
COOLP
HEATN
COOLN
AK2571
PID
Curreny
direction
control
TEC
HEATP
COOLP
HEATN
COOLN
AK2571
IOUT4
I-DAC4
IOUT4B
Figure 4-4 Analog control-1 Figure 4-6 Analog control 2-2
PID
Current
direction
control
TEC
HEATP
COOLP
HEATN
COOLN
AK2571
Current
amp
IOUT4C
I-DAC4C
IOUT4H
I-DAC4H
PID
Currnt
direction
control
TEC
HEATP
COOLP
HEATN
COOLN
AK2571
IOUT4C
I-DAC4C
IOUT4H
I-DAC4H
Table 4-5 pin status
PID data TEC
Control way IOUT4H
IOUT4C HEAT_P
HEAT_N COOL_P
COOL_N
PWM GND GND 1 0
1 0
Analog-1 GND
GND 1
0
1
0
PID=0 OFF
Analog-2 GND
GND 1
0
1
0
PWM GND GND 0 PWM 1 0
Analog-1 Current
out
GND 0
1
1
0
PID>0 Heating
Analog-2 Current
out
GND 0
0
1
0
PWM GND GND 1 0
0 PWM
Analog-1 Current
out
GND 1
0
0
1
PID<0 Cooling
Analog-2 GND
Current
out
1
0
0
0
<Rev. 0.6E Preliminary> -17-
2001/11
