AMCI ME15 Handbuch - Seite 5

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ME15 Magnetic Encoder Manual

Revision 1.1

ME15 SSI OPTION

Supply Voltage........................5 - 30VDC (+/- 5%)

Power Consumption...................< 0.5W

Measuring Range......................360°.

Resolution/Code.......................10 Bit / Binary

Position Accuracy.....................0.5°

Linearity.................................< 0.5%

Repeat Accuracy........................< 0.1%

SSI Interface:

Clock Frequency......................100 KHz – 1 MHz

Output Driver..........................RS 485 (TIA/EIA Compliant)

Short circuit proof outputs:..........Yes ∗

∗ Short circuit to 0V (DC Return) or to output, when supply voltage is correctly applied.

The M15 SSI device has two options of operation: Standalone Option or Multiplexing Option. When M15 works as

Standalone SSI device, data is continuously read-out by simply applying SSI Clock signal with Enable line pulled low

(i.e. tied to the DC Return). When M15 works as Multiplexing SSI device, Enable line determines whether particular

M15's input/output driver is enabled (Enable Input low) or disabled (Enable Input high). Only one unit at the time is

supposed to be enabled and all others disabled.

SSI Protocol

The serial data transmission timing is outlined in Figure 1: With the first falling edge of the clock (CLK) signal, data is

latched into the output shift register. Each subsequent rising CLK edge shifts out one bit data.

The serial word contains 16 bits. The first 10 bits D[9:0] are the absolute angular position data (MSB is clocked out

first). The subsequent 6 bits contain system information; about validity of data such as OCF (Offset Compensation

Finished), COF (Cordic Overflow), LIN (Linearity Alarm), Parity and Magnetic Field status (increase / decrease / out

of range) and they are used for diagnostic purposes only.

Figure 1: Synchronous serial interface with absolute angular position data

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