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AS7225

UART Command Interface

Datasheet

• PUBLIC

DS000496

• v2-00 • 2019-Jun-28

│ 52

11.2

UART Protocol

Figure 79:

UART Protocol

11.3

SPI Timing Characteristics

The AS7225 contains a serial UART interface to connect to a flash memory. An overview can be

found in Figure 83. The required timing characteristics for a serial interface is shown in Figure 81 and

in Figure 82 accordingly. If a Flash memory is used which is not listed in Figure 83 it should be

ensured that the SPI timing is achieved (for debug purposes). Contact ams for requests to

support/verify additional flash devices beyond those listed in the most current device verification

listing.

Figure 80:

SPI Timing Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

SPI Interface

fSCK

Clock frequency

MHz

tSCK_H

Clock high time

tSCK_L

Clock low time

tSCK_RISE

SCK rise time

tSCK_FALL

SCK fall time

tCSN_S

CSN setup time

Time between CSN high-

low transition to first SCK

high transition

After Tbit/2: Sampling of Start Bit

Start Bit

Stop Bit

Data Bits

Start

Next Start

Start Bit detected

Tbit=1/Baud Rate

Always Low

Always High

After Tbit: Sampling of Data

Sample Points

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