AS5045-ASST datasheet(26/47 Pages) AMSCO

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Page 26

ams Datasheet

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[v2-01] 2017-Jul-13

AS5045 − Detailed Description

(see Figure 23: Md0-MD1-Div0,Div1-Indx-Z0…Z11, ccw).

If a capacitor is connected to pin PROG, it should be removed

during analog readback mode to allow a fast readout rate. If the

capacitor is not removed the analog voltage will take longer to

stabilize due to the additional capacitance.

The measured analog voltage for each bit must be subtracted

from the previously measured Vref, and the resulting value gives

an indication on the quality of the programmed bit: a reading

of <100mV indicates a properly programmed bit and a reading

of >1V indicates a properly unprogrammed bit.

A reading between 100mV and 1V indicates a faulty bit, which

may result in an undefined digital value, when the OTP is read

at power-up.

Following the 18th clock (after reading bit “ccw”), the chip must

be reset by disconnecting the power supply.

Figure 26:

OTP Register Analog Read

Vunprogrammed

CSn

CLK

116

PROG

ProgEN

Mag

Comp

PWM

halfEN

Analog Readback Data at PROG

OutpEN

CLKAread

Prog changes to Output

Vref

PWM

Dis

Z10

Z11

t LoadProg

Internal

test bit

digital

Vprogrammed

CCW

Power- on-

Reset;

turn off

supply

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