3150 データシートの表示（PDF） - Allegro MicroSystems
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3150 Datasheet PDF : 12 Pages
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3150
PROGRAMMABLE, CHOPPER-
STABILIZED, PRECISION,
HALL-EFFECT SWITCH
PROGRAMMING PROTOCOL
The A3150JLT and A3150JUA operate points are pro-
grammed by serially addressing the device through the
supply terminal (pin1). After the correct operate point is
determined, the device programming bits are selected and
then a “lock” set to prevent any further (accidental)
programming.
VPP
Program Enable. To program the device, a sequence of
pulses is used to activate/enable the addressing mode as
shown in figure 1. This sequence of a VPP pulse, at least
VPH
seven VPH pulses, and a VPP pulse with no supply interrup-
VPL
tions, is designed to prevent the device from being pro-
0
grammed accidentally (for example, as a result of noise on
the supply line).
PROGRAM ENABLE
(AT LEAST 7 PULSES)
td(1)
td(1)
td(0)
Dwg. WH-013
Figure 1 — Program enable
PROGRAMMING PROTOCOL over operating temperature range.
Characteristic
Symbol Description
Programming Voltage
VPL
Minimum voltage during programming
VPH
VPP
Programming Current
IPP
Max. supply current during programming
Pulse Width
td(0)
OFF time between bits
td(1)
Enable, address, program, or lock bit ON time
tdP
Program pulse ON time
Pulse Rise Time
tr
VPL to VPH or VPP
Pulse Fall Time
tf
VPH or VPP to VPL
NOTE: Typical data is at TA = +25°C and is for design information only.
Limits
Min. Typ. Max.
4.5 5.0 5.5
9.0 10 11
20 23 25
– 250 –
20
–
–
20
–
–
100 300 –
11
–
–
5.0
–
–
Units
V
V
V
mA
µs
µs
µs
µs
µs
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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