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A1181 Datasheet(PDF) 6 Page - Allegro MicroSystems

Part No. A1181
Description  Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A1181 Datasheet(HTML) 6 Page - Allegro MicroSystems

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TWO-WIRE, PROGRAMMABLE, UNIPOLAR HALL-EFFECT SWITCH FAMILY
(PRELIMINARY INFORMATION – SUBJECT TO CHANGE)
Rev. 1.8 25 April 2003
Page 6
115 Northeast Cutoff, Box 15036
Worcester, Massachus etts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
PROGRAMMING PROTOCOL
The operate points are programmed by serially addressing the devices through the supply terminal VCC (pin 1). After the
correct operate point is determined, the device programming bits are permanently blown, and a locking bit is blown to
prevent any further programming.
Switch Point Program Enable. To program the device, a keying sequence is used to activate / enable the addressing
mode as shown in Figure 1. This sequence consisting of a VPP pulse, one VPH pulse, and a VPP pulse with no supply
interruptions, is designed to prevent the device from being programmed accidentally (e.g., as a result of noise on the
supply line).
Figure 1. Program Enable Pulse Sequence.
Valid over operating temperature range unless otherwise noted.
Limits
Part Number
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
PROGRAMMING PROTOCOL (TA = +25 °C)
VPL
Minimum voltage range
during programming
4.5
5
5.5
V
VPH
11.5
12.5
13.5
V
Programming Voltage
6
VPP
25
26
27
V
Programming Current
IPP
tr = 11us, 5V→26V,
Cbypass = 0.1uF
-
190
-
mA
td(0)
OFF time between bits
20
-
-
µs
td(1)
Pulse duration for enable
and addressing
sequences
20
-
-
µs
Pulse width
tdP
Pulse duration for fuse
blowing
100
300
-
µs
Pulse Rise Time
tr
VPL to VPH or VPP
5
-
100
µs
A118X Family
Pulse Fall Time
tf
VPH or VPP to VPL
5
-
100
µs
6
Programming Voltages are measured at Pin #1 (Vcc) of SIP. A minimum capacitance of 0.1uF must be connected from Vcc to GND of the SIP to
provide the current necessary to blow the fuse.


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