A1180EUA-T ALLEGRO [Allegro MicroSystems], A1180EUA-T Datasheet - Page 14

• Manufacturer Part Number: A1180EUA-T
• Description: Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
• Manufacturer: ALLEGRO [Allegro MicroSystems]

Enabling Addressing Mode.
keying sequence used to enable the bitfi eld addressing mode. As
shown in fi gure 7, this segment consists of one short V
one V
ruptions. This sequence is designed to prevent the device from
being programmed accidentally, such as by noise on the supply
line.
Address Selection.
target bitfi eld address, is indicated by a series of V
shown in fi gure 8.
Lock Bit Programming.
is programmed, and all of the corresponding bitfi eld-level fuses
are blown, the device-level fuse should be blown. To do so, the
lock bit (bitfi 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 bitfi elds, as shown in fi gure 9.
A1180-DS, Rev. 2
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
PM
pulse, and one short V
After addressing mode is enabled, the
After the desired B
The fi rst segment of code is a
PH
pulse, with no supply inter-
OP
calibration value
PM
A1180/81/82/83
pulses, as
PH
pulse,
V
V
V
V
V
V
V
V
V
PH
PM
PH
PM
PH
PM
PL
PL
PL
0
0
0
V+
V+
V+
Figure 9. Pulse sequence to encode lock bit
Figure 7. Addressing mode enable pulse sequence
Figure 8. Pulse sequence to select addresses
Falling edge of final B
Enable
Address 1
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Address 2
OP
Encode Lock Bit
address digit
32 pulses
Address
Address n ( ≤ 31)
t
t
Blow
t
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