ZMT31
ANGLE SENSOR
DESCRIPTION
Th e ZMT31 a llo w s th e co n ta ctle s s co u n tin g o f th e re vo lu tio n s o f a
ro ta tin g m a g n e t w h ich is m o u n te d o n th e a xis o f a w h e e l. Ze ro o u tp u t
vo lta g e s o f th e Wh e a ts to n e s b rid g e s a re u s e d a s trig g e r s ig n a ls . Th e
s e n s e o f ro ta tio n o f th e w h e e l is ta ke n in to a cco u n t b y co m p a rin g th e
s ig n a l o u tp u ts o f b o th Wh e a ts to n e b rid g e s w h ich a re p ro p o rtio n a l to
s in 2(␣) o r s in 2(␣+45Њ). Th e a n g le ca n b e d e te rm in e d b y e va lu a tin g th e s e
s ig n a ls . Alte rn a tive ly it is p o s s ib le to u s e th e vo lta g e s ig n a ls o f fo u r h a lf
b rid g e s w h ich a re trim m e d o n V
.
b /2
SM8
FEATURES
· Me a s u re s th e m a g n e tic fie ld h ro t (> 50kA/m )
generated by a perm anent m agnet which rotates
over the sensor
· Magnetic field hrot parallel to the chip surface causes
a sinusoidal output signal
· Package : SM-8 (available on 12m m tape)
1
2
8
7
APPLICATION
· Contactless counting of the revolutions of a rotating
m agnet (waterm eters etc.)
3
4
6
5
· Contactless angular m easurem ent
· Autom otive (pedal position etc.)
· Contactless rotary switches
· Contactless potentiom eter
Bridge1: pin 1: -VO pin 5: +VO
pin 8: -V (GND) pin 4: +VB
B
Bridge 2: pin 2: -V pin 6: +VO
O
pin 7: -V (GND) pin 3: +VB
B
ORDERING INFORMATION
VO - output voltage VB - supply voltage
DEVICE
REEL
SIZE
TAPE
WIDTH
QUANTITY
PER REEL
ZMT31TA
ZMT31TC
12m m
12m m
1000
4000
7
13
DEVICE MARKING
· ZMT31
ISSUE 4 - J UNE 2004
S E M IC O N D U C T O R S
1
