AS8218 datasheet(73/123 Pages) AMSCO

73 / 123 page

Data Sheet AS8218 / AS8228

Revision 3.0, 31-May-06

Page 73 of 123

Example Pin List

Pin Name

Type

Functionality

Description

EEP_S_N

Input

Chip select, active low

When this input signal is High, the device is deselected and Serial Data

Output (SO) is at high impedance. Unless an internal Write cycle is in

progress, the device will be in the Standby mode. Driving Chip Select

(S_N) Low enables the device, placing it in the active power mode.

EEP_SO

Output Serial data output

This output signal is used to transfer data serially out of the device. Data

is shifted out on the falling edge of Serial Clock (SC).

EEP_SI

Input

Serial data input

This input signal is used to transfer data serially into the device. It

receives instructions, addresses and the data to be written. Values are

latched on the rising edge of Serial Clock (SC).

EEP_SC

Input

Serial clock

This input signal provides the timing of the serial interface. Instructions,

addresses or data present at Serial Data Input (SI) are latched on the

rising edge of Serial Clock (SC). Data on Serial Data Output (SO)

changes after the falling edge of Serial Clock (SC).

EEP_WP_N

Input

Write protect, active low The main purpose of this input signal is to freeze the size of the area of

memory that is protected against Write instructions (as specified by the

values in the BP1 and BP0 bits of the Status register). This pin must be

driven either High or Low and must be stable during all write operations.

EEP_HOLD_N

Input

Hold, active low

The Hold (HOLD_N) signal is used to pause any serial communications

with the device without deselecting the device. During the Hold

condition, the Serial Data Output (SO) is high impedance, and Serial

Data Input (SI) and Serial Clock (SC) are Don’t Care. To start the Hold

condition, the device must be selected, with Chip Select (S_N) driven

Low.

EEP_VCC

Supply Positive supply voltage

EEP_VSS

Supply Negative supply voltage

Note:

No Write Protect (EEP_WP_N) and Hold (EEP_HOLD_N) pins are available on the AS8218 / AS8228 ICs.

These pins must be tied ‘high’ directly at the EEPROM device.

Instructions Timings

Write Enable (WREN)

Figure 14: Write enable (WREN) sequence

EEP_S_N(in)

EEP_SC(in)

EEP_SI(in)

EEP_SO(out

)

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