AS5140H-ASSU austriamicrosystems, AS5140H-ASSU Datasheet - Page 20

• Manufacturer Part Number: AS5140H-ASSU
• Description: ENCODER, MAGNETIC, ROTARY, 10BIT, 16SSOP
• Manufacturer: austriamicrosystems

Specifications of AS5140H-ASSU

• Brief Features: User Programmable Zero / Index Position, Failure Detection Mode
• Supply Voltage Range: 3V To 3.6V, 4.5V To 5.5V
• Operating Temperature Range: -40°C To +150°C
• Digital Ic Case: RoHS Compliant
• Ic Function: 10-bit Programmable Magnetic Rotary Encoder
• Rohs Compliant: Yes

AS5140H
Data Sheet - D e t a i l e d D e s c r i p t i o n
Programming the AS5140H
Note: A detailed description of the austriamicrosystems low voltage polyfuse OTP programming method is given in
After power-on, programming the AS5140H is enabled with the rising edge of CSn with Prog = high and CLK = low.
The AS5140H programming is a one-time-programming (OTP) method, based on polysilicon fuses. The advantage of
this method is that a programming voltage of only 3.3V is required for programming. The OTP consists of 52 bits, of
which 21 bits are available for user programming. The remaining 31 bits contain factory settings and a unique chip
identifier (Chip-ID).
A single OTP cell can be programmed only once. Per default, the cell is “0”; a programmed cell will contain a “1”. While
it is not possible to reset a programmed bit from “1” to “0”, multiple OTP writes are possible, as long as only
unprogrammed “0”-bits are programmed to “1”. Independent of the OTP programming, it is possible to overwrite the
OTP register temporarily with an OTP write command at any time. This setting will be cleared and overwritten with the
hard programmed OTP settings at each power-up sequence or by a LOAD operation.
The OTP memory can be accessed in several ways:
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Load Operation: The Load operation reads the OTP fuses and loads the contents into the OTP register. Note that
the Load operation is automatically executed after each power-on-reset.
Write Operation: The Write operation allows a temporary modification of the OTP register. It does not program the
OTP. This operation can be invoked multiple times, and will remain set while the chip is supplied with power and
while the OTP register is not modified with another Write or Load operation.
Read Operation: The Read operation reads the contents of the OTP register, for example to verify a Write com-
mand or to read the OTP memory after a Load command.
Program Operation: The Program operation writes the contents of the OTP register permanently into the OTP
ROM.
Analog Readback Operation: The Analog Readback operation allows a quantifiable verification of the program-
ming. For each programmed or unprogrammed bit, there is a representative analog value (in essence, a resistor
value) that is read to verify whether a bit has been successfully programmed or not.
Application Note AN5000-30, which can be downloaded from the austriamicrosystems website. The OTP
programming description in this datasheet is for general information only.
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