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Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
13
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
V
PH
V+
t
V
PM
V
PL
0
Address 1
Address 2
Address n ( d 31)
Figure 8. Pulse sequence to select addresses
Falling edge of final B
OP
 address digit
V
PH
V+
t
V
PM
V
PL
0
Encode Lock Bit
Enable
Address
Blow
32 pulses
Figure 9. Pulse sequence to encode lock bit
Lock Bit Programming. After the desired B
OP
 calibration value
is programmed, and all of the corresponding bit eld-level fuses
are blown, the device-level fuse should be blown. To do so, the
lock bit (bit eld address 32) should be encoded as 1 and have
its fuse blown. This is done in the same manner as permanently
setting the other bit elds, as shown in  gure 9.
Address Selection.  After addressing mode is enabled, the 
target bit eld address, is indicated by a series of V
PM
 pulses, as
shown in  gure 8.
Figure 7. Addressing mode enable pulse sequence
V
PH
V+
t
V
PM
V
PL
0
Enabling Addressing Mode. The  rst segment of code is a 
keying sequence used to enable the bit eld addressing mode. As
shown in  gure 7, this segment consists of one short V
PH
 pulse,
one V
PM
 pulse, and one short V
PH
 pulse, with no supply inter-
ruptions. This sequence is designed to prevent the device from
being programmed accidentally, such as by noise on the supply
line.
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