AS5046-ASST austriamicrosystems, AS5046-ASST Datasheet - Page 31

• Manufacturer Part Number: AS5046-ASST
• Description: IC ENCODER PROG 12-BIT 16-SSOP
• Manufacturer: austriamicrosystems
• Type: Linear, Rotary Encoder - Programmabler

Specifications of AS5046-ASST

• Sensing Range: 45mT ~ 75mT
• Voltage - Supply: 3 V ~ 3.6 V, 4.5 V ~ 5.5 V
• Current - Supply: 21mA
• Current - Output (max): 4mA
• Output Type: Analog, Ratiometric
• Features: Programmable
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AS5046-ASSTTR

AS5046
Data Sheet
15.7 Application Examples
Application Note AN5043-10 shows various application examples for the AS5043 encoder IC. The same application
examples apply for the analog output of the AS5046.
16 Analog Readback Mode
Non-volatile programming (OTP) uses on-chip zener diodes, which become permanently low resistive when subjected
to a specified reverse current.
The quality of the programming process depends on the amount of current that is applied during the programming
process (up to 130mA). This current must be provided by an external voltage source. If this voltage source cannot
provide adequate power, the zener diodes may not be programmed properly.
In order to verify the quality of the programmed bits, an analog level can be read for each zener diode, giving an
indication whether this particular bit was properly programmed or not.
To put the AS5046 in Analog Readback Mode, a digital sequence must be applied to pins CSn, PROG and CLK as
shown in Figure 18. The digital level for this pin depends on the supply configuration (3.3V or 5V; see section 9).
The second rising edge on CSn (OutpEN) changes pin PROG to a digital output and the log. high signal at pin PROG
must be removed to avoid collision of outputs (grey area in Figure 18).
The following falling slope of CSn changes pin PROG to an analog output, providing a reference voltage V
, that
ref
must be saved as a reference for the calculation of the subsequent programmed and unprogrammed OTP bits.
Following this step, each rising slope of CLK outputs one bit of data in the reverse order as during programming.
(see Figure 18: Output Range OR0 and -1 , ClampMdEn, RefExtEn, FB_IntEn, Z0…Z9, ccw)
During analog readback, the capacitor at pin PROG (see Figure 15) should be removed to allow a fast readout rate.
The measured analog voltage for each bit must be subtracted from the previously measured V
, and the resulting
ref
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.
th
Following the 16
clock (after reading bit “ccw”), the chip must be reset by disconnecting the power supply.
Figure 18
Analog OTP Register Read
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