Programmable Back Biased Hall-Effect
Switch with TPOS Functionality
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ATS636LSE
Program Enable To program the device, a keying sequence
is used to activate / enable the programming mode as shown in
figure 4. This program key sequence consisting of a VPP pulse, at
least seven VPH pulses, and a VPP pulse with no supply interrup-
tions. The sequence is designed to prevent the device from being
programmed accidentally (e.g., as a result of noise on the supply
line).
Code Programming After the desired switchpoint code is
selected (0 through 127), each bit of the corresponding binary
address should be programmed individually, not at the same
time. For example, to program code 5 (binary 000101), bits 1 and
3 need to be programmed. A bit is programmed by addressing
the code and then applying a V
PP
pulse, the programming is not
reversible. An appropriate sequence for blowing code 5 is shown
in figure 5.
Polarity Bit Programming If the desired switchpoint has
negative polarity, the polarity bit must be programmed. To do this
it is necessary to first apply the polarity key sequence before the
program key sequence (figure 6). Finally a V
PP
pulse of duration
t
dP
must be applied to program this bit, the programming is not
reversible. The polarity bit is for adjusting programming range
only and will not affect the output polarity.
0
t
d(1)
t
d(1)
t
d(0)
PROGRAM ENABLE
7 or More Pulses
(8 Pulses Shown)
V
PL
V
PH
V
PP
Figure 4. Program Enable Pulse Sequence
Figure 5. Code Programming Example
V
PH
V
PP
Program Enable
0
V
PL
t
d(1)
t
d(1)
t
d(0)
t
dP
Figure 6. Polarity Bit Programming
V
PH
V
PP
Program Enable
Bit 3 Address
000100
Code 4
Program Enable
0
V
PL
t
d(1)
t
d(1)
t
d(0)
t
dP
000001
Code 1
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