IC-PVL Datasheet, PDF(25/33 Page) IC-Haus GmbH – LINEAR/OFF-AXIS BATTERY-BUFFERED HALL MULTITURN ENCODER

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IC-PVL Datasheet, PDF (25/33 Pages) IC-Haus GmbH – LINEAR/OFF-AXIS BATTERY-BUFFERED HALL MULTITURN ENCODER

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iC-PVL LINEAR/OFF-AXIS

preliminary

BATTERY-BUFFERED HALL MULTITURN ENCODER

SUPPLY SWITCH AND BATTERY MONITORING

Rev B3, Page 25/33

To retain and acquire the absolute position even on

main power failure, iC-PVL monitors VDD and switches

to a battery supply on pin VBAT automatically. The

switching point is just below 3 V. So, if the main supply

voltage on VDD drops below 3 V, the internal circuitry

will be powered by VBAT instead of VDD.

The supply switch features a built-in hysteresis. The

threshold voltages are defined in the Electrical Charac-

teristics: Voff (Item No. 402), the voltage at which the

circuit switches from VDD supply to VBAT supply, and

Von (Item No. 401) for the voltage at which the circuit

switches back to VDD supply.

BAT_MON

Code

Note

Addr. 0x03; bit 6

Function

Battery monitoring off

Battery monitoring on

*) Battery monitoring is active during VDD supply.

Table 31: Enable battery monitoring

Depending on the power pack, e.g. a 3.6 V battery

with 1 Ah capacity, the device can operate for several

years. During VDD supply, the iC-PVL monitors the

voltage at pin VBAT to detect a low battery voltage. If

the supply drops below the error threshold Verr voltage

(Item No. 404), an error is generated and signalized at

pin NERR, by the error bit in the SSI communication

protocol, and by the I2C status register. The battery

monitoring function can be enabled/disabled with the

configuration parameter BAT_MON (Table 31).

Additionally, if battery monitoring is enabled by param-

eter BAT_MON, an early battery warning message is

generated. The warning threshold is specified in Vwrn

(Elec. Char. No. 405). If the voltage at pin VBAT

drops below this warning threshold, a warning is gener-

ated and signalized at pin NWRN and optionally by the

warning bit of the SSI data (refer to Table 22).

The thresholds of Verr and Vwrn are defined by Elec.

Char. 404 and Elec. Char. 405. They can be config-

ured with configuration parameter BAT_THR according

to Table 32.

BAT_THR

Code

00*

Notes

Addr. 0x05; bit 3:2

Verr

Vwrn

3.05

3.15

2.95

3.05

2.85

2.95

2.75

2.85

Nominal values. Refer to Elec. Char. 404 and 405

for variation.

*) BAT_THR = 0x00 is recommended.

Table 32: Battery monitor threshold levels

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