U426B Datasheet, PDF (2/6 Pages) TEMIC Semiconductors – INFRARED DRIVER

U426B
Pin Description
V_{S 1}
8 GND
DATA 2
MON–I 3
U426B
7 ^IRED
6 SHUNT
MON–O 4
5 WAKE
95 9877
Figure 2. Pinning
Pin Symbol
Function
1
V_S Supply voltage
8
GND Circuit ground
2
DATA Data input for switching the
IRED output current on and off
7
IRED IR-LED output; when the data
input is high, this output supplies
the IR LED with the constant
current
6 SHUNT The resistor at this pin adjusts
the IRED output current
3 MON-I Voltage monitor input of the
internal comparator
4 MON-O Voltage monitor output. This
open collector output is active
when the voltage at MON-I is
below the internal reference
V₃ = 525 mV typ.
5 WAKE WAKE input. When being LOW,
the circuit is in standby mode. A
high level activates the circuit
Block Diagram
V_S
DATA
WAKE
MON–O
MON–I
Power
supply
V_Shunt
= 150 mV
typ.
V₃
= 525 mV
typ.
–
+
COMP
+
–
DRV
GND
COMP Monitoring comparator
DRV IRED constant current driver
Figure 3. Block diagram
I_RED
SHUNT
95 9948
2 (6)
Rev. A2, 15-Oct-98