MicroE Mercury II 6000 - Manual (Page 32)

Appendix
IM-Mercury_II_6000 Series Rev. 1 Page 31 ©2014 MicroE Systems
Mercury II 6000 Series Encoders
Installation Manual and Reference Guide
Output Signal Specifications

SDATA_OUT

SCLOCK_OUT
Parameter Minimum Typical Maximum
Differential Output Voltage 500 mv 2v 2.5v
Common Mode Output Voltage 500 mv 2v 2.5v
Termination 120 ohms across each differential pair
Input Signal Specifications

SLOCK_IN

nCS
Parameter Minimum Typical Maximum
Differential Output Voltage 150 mV
Common Mode Output Voltage 1.1v 1.6v 1.9v
Absolute Maximum Single-Ended Voltage -0.3V 2v 1.9V
Recommended Common Mode Voltage 1.2v 2v 2.5v
Recommended Differential Input Voltage 250 mv 2v 2.5v
Impedance 120 ohm
Signal Definitions
Signal Definition
SDATA_OUT
The serial data output to the host. The data word consists of 4 start bits, a position word of 4 to
35 bits, 9 bits of status, a 6-bit CRC to provide error detection capability, followed by 4 stop
bits.
SCLOCK_OUT
The output clock is synchronous to the input clock with a phase delay. It is used by the host as
the clock for the serial data output.
SCLOCK_IN
Provided by the host to the sensor and used by the encoder as the system clock.
Note: An interruption in the input clock could cause a loss of encoder position.

Clock frequency requirements: 30MHz to 50MHz
nCS
The host uses this line to initiate a position sample. The nCS logic is “negative true”. Each
time the sensor detects a falling edge on this signal, a position sample is sent to the host.

Maximum position sample frequency (falling edge to falling edge): 220 clock cycles

Minimum Pulse Width (high or low): 2 clock cycles
Power-Up Sequence
Power is supplied from the host to the sensor. After power is supplied, the following sequence is
performed:

The sensor waits for the serial clock to be provided by the host on the signal SCLOCK_IN
for 100ms.

If a clock is not provided, the sensor switches to operate in the final mode (quadrature or
serial).

Upon detecting a serial clock on SCLOCK_IN, the sensor returns the clock to the host on
SCLOCK_OUT.

Within the first 500ms after the serial clock is provided by the host, SCLOCK_OUT may
be unstable.