A1183 ALLEGRO [Allegro MicroSystems], A1183 Datasheet - Page 13
A1183
Manufacturer Part Number
A1183
Description
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
Manufacturer
ALLEGRO [Allegro MicroSystems]
Datasheet
1.A1183.pdf
(15 pages)
A1180, A1181,
A1182,
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.
PM
pulse, and one short V
and
A1183
After addressing mode is enabled, the
After the desired B
The fi rst segment of code is a
PH
Chopper-Stabilized Unipolar Hall Effect Switches
pulse, with no supply inter-
OP
calibration value
PM
Sensitive Two-Wire Field-Programmable
pulses, as
PH
pulse,
V
V
V
V
V
V
V
V
V
PM
PH
PM
PH
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
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Address 2
OP
Encode Lock Bit
address digit
32 pulses
Address
Address n ( ≤ 31)
t
t
Blow
t
13