A1172ECGLT Allegro Microsystems Inc, A1172ECGLT Datasheet - Page 8

• Manufacturer Part Number: A1172ECGLT
• Description: IC,HALL-EFFECT SWITCH,SINGLE-ENDED,BGA,4PIN,PLASTIC
• Manufacturer: Allegro Microsystems Inc
• Type: Omnipolar Switchr

Specifications of A1172ECGLT

• Sensing Range: ±55G Trip, ±6G Release
• Voltage - Supply: 1.65 V ~ 3.5 V
• Current - Supply: 2mA
• Current - Output (max): ±1mA
• Output Type: Digital, Push-Pull
• Features: High Sensitivity
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 4-WLCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1244-2; A1172ECGTR

A1172
Low Average Power
Internal timing circuitry activates the IC for 50 μs and deacti-
vates it for the remainder of the period (50 ms). A short awake
time allows stabilization prior to the sampling and data-latching
on the falling edge of the timing pulse. The output during the
sleep state is latched in the last sampled state. The supply current
is not affected by the output state.
Operation
The VOUTPS output switches low (turns on) when a magnetic
field perpendicular to the Hall element exceeds the operate point,
I
I
DD(DIS)
V+
DD(EN)
0
B–
Figure 1. Switching Behavior of Omnipolar Switches. On the horizontal axis, the B+ direction indicates increasing
south polarity magnetic field strength, and the B– direction indicates decreasing south polarity field strength
(including the case of increasing north polarity).
0
B
HYS
Sample and Output Latched
Awake
(A) VOUTPS
0
t
Sleep
Period
B
HYS
Micropower Ultra-Sensitive Hall-Effect Switch
B+
Functional Description
V
V
OUT(HIGH)
OUT(SAT)
B
is V
rent up to the short circuit current limit, I
mum of 1 mA. When the magnetic field is reduced below the
release point, B
switches high (turns off). The pull-up transistor brings the output
voltage to V
VOUTPN operates with the opposite output polarity. That is, the
output is low (on) in the absence of a magnetic field. The output
goes high (turns off) when sufficient field, of either north or
south polarity, is presented to the device.
The difference in the magnetic operate and release points is the
hysteresis, B
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
The push-pull outputs are capable of sourcing or sinking a maxi-
mum of 1 mA.
Powering-on the device in a hysteresis region, between B
and B
is attained after the first excursion beyond B
OPS
V+
0
OUT(SAT)
B–
(or is less than B
RPX
, allows an indeterminate output state. The correct state
OUT(HIGH)
. The output transistor is capable of sinking cur-
HYS
B
HYS
RPS
, of the device. This built-in hysteresis allows
(or increased above B
(B) VOUTPN
.
OPN
). After turn-on, the output voltage
115 Northeast Cutoff
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Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
0
B
HYS
OM
RPN
, which is a mini-
OPX
), the device output
or B
B+
RPX
V
V
OUT(HIGH)
OUT(SAT)
.
OPX
8