AS5013 datasheet(21/50 Pages) AMSCO

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[v2-00] 2021-Apr-19

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AS5013 − Detailed Description

High Speed Mode

The AS5013 is capable to work in HS-mode.

For switching to HS-mode the Master has to send the sequence:

START, MASTER CODE, NACK. This sequence is sent in FS-mode.

As no device is allowed to acknowledge the master code, the

master code is followed by a not-acknowledge. After a device

receives the master code it has to switch from FS-settings to

HS-settings within tSU.STA which is 160ns for HS-mode. The

device stays in HS-mode as long as it does not receive a STOP

command. After receiving a STOP command it has to switch

back form HS-settings to FS-settings, which has to be competed

within the minimum bus free time tBUF which is 500ns.

When switching to HS-mode the slave has to:

• Adapt the SDAH and SCLH input filters according to the

spike suppression requirement required in HS-mode. In

HS-mode spikes up to 10ns, in FS-mode spikes up to 50ns

have to be suppressed.

• Adapt the setup and hold times according to the HS-mode

requirement. In HS-mode an internal hold time for SDA for

START/STOP detection of 80ns (max. 150ns), in FS-mode

an internal hold time of 160ns (max. 250ns) has to be

provided.

• Adapt the slope control for SDAH output stage.

Figure 21:

Data Transfer Format in HS-Mode

Master code

NA Sr

Slave Address R/W

DATA

Slave Address

F/S mode

Hs mode (current source for SCLH enabled)

F/S mode

Hs mode continues

< n bytes + ack >

AS5013 데이터시트(PDF) 21 Page - ams AG