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| 型号： | A1184ELHLT-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 487K |
| 描述： | IC SWITCH HALL EFFECT UNI SOT-23 |
| 产品培训模块： | Current Sensor |
| 标准包装： | 3,000 |
| 传感范围： | 300G ~ 600G - 可编程，固定释放 |
| 类型： | 单极开关 |
| 电源电压： | 3.5 V ~ 24 V |
| 电流 - 电源： | 6.9mA |
| 输出类型： | 数字式，差分 |
| 特点： | 可编程 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | SOT-23W |
| 供应商设备封装： | SOT-23W |
| 包装： | 带卷 (TR) |
Standard Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switch
A1184
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
PROGRAMMING PROTOCOL CHARACTERISTICS, over operating temperature range, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min. Typ. Max. Units
Programming Voltage
1
V
PL
Minimum voltage range during programming
4.5 5.0 5.5 V
V
PM
11.5 12.5 13.5 V
V
PH
25.0 26.0 27.0 V
Programming Current
2
I
PP
t
r
= 11 約; 5 V ?26 V; C
BYP
= 0.1 糉
- 190 -
mA
Pulse Width
t
d(0)
OFF time between programming bits
20
-
-
約
t
d(1)
Pulse duration for enable and addressing
sequences
20
-
-
約
t
d(P)
Pulse duration for fuse blowing
100 300 -
約
Pulse Rise Time
t
r
V
PL
to V
PM
;
V
PL
to V
PH
5
-
20 約
Pulse Fall Time
t
f
V
PM
to V
PL
; V
PH
to V
PL
5
- 100 約
1
Programming voltages are measured at the VCC pin.
2
A bypass capacitor with a minimum capacitance of 0.1 糉 must be connected from VCC to the GND pin of the A118x device in order to
provide the current necessary to blow the fuse.
V
PH
V+
t
V
PM
V
PL
0
T
d(1)
T
d(0)
T
d(P)
Figure 4. Pulse amplitudes and durations
Additional information on device programming and program-
ming products is available on www. allegromicro.com. Program-
ming hardware is available for purchase, and programming
software is available free of charge.
Programming Protocol
The operate switchpoint, B
OP
, can be field-programmed. To do
so, a coded series of voltage pulses through the VCC pin is used
to set bitfields in onboard registers. The effect on the device
output can be monitored, and the registers can be cleared and
set repeatedly until the required B
OP
is achieved. To make the
setting permanent, bitfield-level solid state fuses are blown, and
finally, a device-level fuse is blown, blocking any further cod-
ing. It is not necessary to program the release switchpoint, B
RP
,
because the difference between B
OP
and B
RP
, referred to as the
hysteresis, B
HYS
, is fixed.
The range of values between B
OP(min)
and B
OP(max)
is scaled to
31 increments. The actual change in magnetic flux (G) repre-
sented by each increment is indicated by B
RES
(see the Operating
Characteristics table; however, testing is the only method for
verifying the resulting B
OP
). For programming, the 31 incre-
ments are individually identified using 5 data bits, which are
physically represented by 5 bitfields in the onboard registers.
By setting these bitfields, the corresponding calibration value is
programmed into the device.
Three voltage levels are used in programming the device: a low
voltage, V
PL
, a minimum required to sustain register settings; a
mid-level voltage, V
PM
, used to increment the address counter
in the device; and a high voltage, V
PH
, used to separate sets of
V
PM
pulses (when short in duration) and to blow fuses (when
long in duration). A fourth voltage level, essentially 0 V, is used
to clear the registers between pulse sequences. The pulse values
are shown in the Programming Protocol Characteristics table and
in figure 4.
Code Programming. Each bitfield must be individually set. To
do so, a pulse sequence must be transmitted for each bitfield that
is being set to 1. If more than one bitfield is being set to 1, all
pulse sequences must be sent, one after the other, without allow-
ing V
CC
to fall to zero (which clears the registers).
The same pulse sequence is used to provisionally set bitfields as
is used to permanently set bitfield-level fuses. The only differ-
ence is that when provisionally setting bitfields, no fuse-blowing
pulse is sent at the end of the pulse sequence.
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