ACS70310 datasheet(11/27 Pages) ALLEGRO

11 / 27 page

Very High Precision, Programmable Linear Hall-Effect Sensor IC

with Reverse Battery Protection and High-Bandwidth (240 kHz)

Analog Output for Core-Based Current Sensing

ACS70310

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

FUNCTIONAL DESCRIPTIONS

Power-On Reset (POR)

The descriptions in this section assume: Temperature = 25°C, no

output load (RL, CL), and no significant magnetic field is present.

When the device is off, the output will be in a high-impedance

state.

Power-On

As VCC ramps up, the device output is in high impedance until

VCC reaches VPOR(H). As VCC rises above VPOR(H), the device’s

output leaves the high impedance state and enters normal operat-

ing mode.

Overvoltage Detection (VOVD)

When VCC is raised above the Overvoltage Detection enable volt-

age (VOVD(EN)), the ACS70310 output stage enters high imped-

ance. VOUT will float: to VCC with a pull-up RL, or to GND with

a pull-down RL, when VOVD(EN) is reached. When programing

the ACS70310, Overvoltage Detection must be active for com-

munication. The ACS70310 output will resume normal operation

after VCC is below the Overvoltage Detection disable voltage

VOVD(DIS). Note that Supply Voltage limits still apply for operat-

ing characteristic.

Power-Down

As VCC ramps down, the device output is active until VCC falls

below VPOR(L). As VCC falls below VPOR(L), the device’s output

will enter a high impedance state.

Power On/Off Profile

Figure 8 shows the analog output of a device at power on and

power off.

Figure 8: Power On/Off and Overvoltage Detection (OVD), no RL

VCC = C1 (yellow), VOUT = C2 (red), ICC = C4/10 (green)

ACS70310 Datasheet(PDF) 11 Page - Allegro MicroSystems