Programming Logic
Register Selection Key
Bitfield Address
Description
Binary Format
(MSB ?/SPAN> LSB)
Decimal Equivalent
Code
Mode Register Selection
Blow / Lock
1
01
1
Blow or Lock
Try
2
10
2
Try
Parameter Register Selection
Sensitivity / Coarse D
(Q)
1
000000000
0
Initial value; D
(Q)
= D
(Q)PRE
,
Sens = Sens
PRE
011111111
255
Maximum gain value in range
100000000
256
Enable Coarse D
(Q)
bit; switch from bidirectional
programming to unidirectional programming,
D
(Q)
= D
(Q)UNIinit
Fine D
(Q)
(B = 0 gauss)
2
000000000
0
Initial value
011111111
255
Maximum D
(Q)
in range
100000000
256
Switch from programming increasing D
(Q)
to
programming decreasing D
(Q)
111111111
511
Minimum D
(Q)
in range
PWM Frequency /Coarse PWM Frequency
3
00000
0
Initial value; f
PWM
= f
PWMPRE
01111
15
Minimum f
PWM
in f
PWM(fast)
range
10000
16
Enable Coarse f
PWM
bit; switch from f
PWM(fast)
programming to f
PWM(slow)
programming,
f
PWM
= f
PWM(slow)init
11111
63
Minimum f
PWM
in f
PWM(slow)
range
Null
4
Recommended to be selected before and during test
measurements performed in Try mode
Calibration Test Mode / Lock All
5
0000000000
0
Initial value
0000010000
16
Enable 50% duty cycle Calibration Test Mode bit
1000000000
512
LOCK bit; lock all device registers
High Precision 2-Wire Linear Hall Effect Sensor IC
with Pulse Width Modulated Output
A1354
18
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com