TSM931 TOUCHSTONE [Touchstone Semiconductor Inc], TSM931 Datasheet - Page 16

• Manufacturer Part Number: TSM931
• Description: Ultra Low-Power Single/Dual-Supply Comparators with Reference
• Manufacturer: TOUCHSTONE [Touchstone Semiconductor Inc]

TSM931-TSM934
Page 16
Figure 6. Bar-Graph Level Gauge
6. Using the equations below, verify all resistor
In this example, a 1MΩ, 1% standard value
resistor is selected for R3.
values selected:
V
= 5.474V
V
Where the hysteresis voltage is given by:
V
OTH
OTH
HYS
1.068MΩ – 61.9kΩ
1.006MΩ
4.484V
(V
(V
V
REF
REF
REF
x
+ V
R5
R4
V
HYS
HYS
) x
) x
R1 + R2 + R3
R1 + R2 + R3
(R1+R2)
R1
Bar-Graph Level Gauge
A simple four-stage level detector is shown in
Figure 6 using the TSM934. Due to its high output
source capability, the TSM921 is perfect for driving
LEDs. When all of the LEDs are on, the threshold
voltage is given as V
threshold voltages are scaled down accordingly by
¾, ½, and ¼ the threshold voltage. The current
through the LEDs is limited by the output resistors.
Level Shifter
Figure 7 provides a simple way to shift from bipolar
±5V inputs to TTL signals by using the TSM934. To
protect the comparator inputs, 10kΩ resistors are
placed in series and do not have an effect on the
performance of the circuit.
Two-Stage Low-Voltage Detector
A two step, input voltage monitoring circuit can be
designed using the TSM932 as shown in Figure 8. In
this circuit, when V
thresholds, the outputs will be HIGH. The design
procedure used to design the window detector can
be used to design this circuit.
Figure 7. Level Shifter: ±5V Input into CMOS output
IN
IN
is above the LOW and FAIL
=(R1 + R2)/R1 volts. All other
TSM931_34DS r1p0
RTFDS