iC-NZ
FAIL-SAFE LASER DIODE DRIVER
Rev B2, Page 14/20
VDD
REGEN
LENL
LENM
LENH
SDIS
VDD
RVDD
LDA
VDD
C1
Current Monitor
Safety
Monitor
Diode
S1
RSI
EN
CLDA
LDAOK
NTREN
RSI
NSEN
LD MD
Finite State Machine
RMDH
NSEN
RMH
LDKH
CIH
VREF
VREF
VREF
Safety Monitor Diode
+
−
MDL
CIH
Laser Driver
APC
LDKM
CIM
SMD
+
SMD(1)
SMD(0)
MDL
+
−
−
MDOK
VSAH
Monitor
+
RSMD
−
LDKL
CIL
VSAL
RGND
+
−
CIL
MDL
AGND
RML
GND
CREF
Figure 10: Two-channel operation with safety function (N-type laser diode)
VDD
REGEN
LENL
LENM
LENH
SDIS
VDD
RVDD
LDA
VDD
RSI
Current Monitor
C1
S1
RML
CLDA
RMH
RSI
LDAOK
NTREN
NSEN
MDL
EN
Finite State Machine
RMDM
RMDH
NSEN
LDKH
CIH
SMD
VREF
VREF
VREF
Safety Monitor Diode
+
−
MDL
LD MD
CIH
Laser Driver
APC
LDKL
CIM
SMD
+
SMD(1)
SMD(0)
MDL
+
−
−
MDOK
VSAH
RSMD
Monitor
+
−
LDKL
CIL
VSAL
RGND
+
−
CIL
AGND
GND
CREF
Figure 11: Two-channel operation with safety function (P-type laser diode)