CS5460A datasheet(24/54 Pages) CIRRUS

24 / 54 page

CS5460A

DS487F4

pulse, one of the output pins (either EOUT or

EDIR) changes state. When the CS5460A must is-

sue another energy pulse, the other output chang-

es state. The direction the motor will rotate is

determined by the order of the state changes.

When energy is positive, EOUT will lead EDIR

such that the EOUT pulse train will lead the EDIR

pulse train by ~1/4 of the periods of these two

pulse train signal. When energy is negative, EDIR

will lead EOUT in a similar manner. See Figure 12.

3.3 Auto-boot Mode Using EEPROM

The CS5460A has a MODE pin. When the MODE

pin is set to logic low, the CS5460A is in normal op-

erating mode, called host mode. This mode de-

notes the normal operation of the part, that has

been described so far. But when this pin is set to

logic high, the CS5460A auto-boot mode is en-

abled. In auto-boot mode, the CS5460A is config-

ured to request a memory download from an

external serial EEPROM. The download sequence

is initiated by driving the RESET pin to logic high.

Auto-boot mode allows the CS5460A to operate

without the need for a microcontroller. Note that if

the MODE pin is left unconnected, it will default to

logic low because of an internal pull-down on the

pin.

3.3.1 Auto-boot Configuration

Figure 13 shows the typical connections between

the CS5460A and a serial EEPROM for proper au-

to-boot operation. In this mode, CS and SCLK are

driven outputs. SDO is always an output. During

the auto-boot sequence, the CS5460A drives CS

low, provides a clock output on SCLK, and drives

out-commands on SDO. It receives the EEPROM

data on SDI. The serial EEPROM must be pro-

grammed with the user-specified commands and

change any of the default register values (if de-

sired) and begin conversions.

Figure 13 also shows the external connections that

would be made to a calibrator device, such as a PC

EOUT

EDIR

Positive Energy

Negative Energy

...

Figure 12. Stepper Motor Format on EOUT and EDIR

CS5460A

EEPROM

/EOUT

/EDIR

MODE

SCK

SDI

SDO

/CS

SCK

/CS

Connector to

Calibrator

VD+

5 K

Mech. Counter

Stepper Motor

Figure 13. Typical Interface of EEPROM to CS5460A

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