AR1011 datasheet(21/61 Pages) MICROCHIP

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DS40001393C-page 21

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER

5.7

Timing – Bit Details

5.7.1

BIT RATE

The SPI standard does not specify a maximum data

rate for the serial bus. In general, SPI data rates can be

in MHz. Peripherals devices, such as the AR1021

controller, specify their own unique maximum SPI data

rates.

The maximum SPI bit rate for the AR1021 controller is

~900 kHz.

Characterization has been performed at bit rates of ~39

kHz and ~156 kHz.

5.7.2

INTER-BYTE DELAY

The AR1021 controller requires an inter-byte delay of

~50 us. This means the host should wait ~50 us

between the end of clocking a given byte and the start

of clocking the next byte.

5.7.3

BIT TIMING – DETAIL

Characterized timing details are shown below, in

Figure 5-4.

FIGURE 5-4:

SPI BIT TIMING – DETAIL

TABLE 5-3:

SPI BIT TIMING MIN. AND MAX. VALUES

Parameter Number(1)

Parameter Description

Min.

Max.

Units

SS↓ (select) to SCK↑ (initial)

500

—

SCK high

550

—

SCK low

550

—

SCK↓ (last) to SS↑ (deselect)

800

—

SDI setup before SCK↓

100

—

SDI hold after SCK↓

100

—

SDO valid after SCK↓

—150

SDO↑ rise

—

SDO↓ fall

—

SS↑ (deselect) to SDO High-z

Note 1:

Parameters are characterized, but not tested.

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