AS1163 datasheet(30/91 Pages) AMSOSRAM

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AS1163

Functional description

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The SIO mode is defined by pull-up/pull-down resistors connected to the SIO pins. A device

will monitor each SIO pin at startup to detect the programmed SIO mode for SIO1 and SIO2.

The recommended value for the pull-up and pull-down resistors is 10 kOhm. SAID SIO ports

are equipped with an internal typical pull-down resistance of 100kOhm, so each of the listed

pull-down cases may leave out the external pull-down. An external pull-down is recommended.

Table 8: SIO communication modes vs. pull-up/down resistors

SIOx_P

SIOx_N

R @ SIOx_P

R @

SIOx_N

Input

Output

Input

Output

Comment

Pdown

LVDS

(Manchester)

LVDS

(Manchester)

LVDS

(Manchester)

LVDS

(Manchester)

LVDS mode

Pdown

Pup

Data (NRZ)

Clock (NRZ)

MCU mode

EOL

Pup

Pdown

Clk & Data

(Manchester)

Data (NRZ)

Clock (NRZ)

MCU mode,

normal

(Type A)

Pup

Pdown

Data (NRZ)

Only SIO1

port

Clock(NRZ)

Only SIO1

port

MCU normal

mode (Type

B), 2 wire

SPI

(selectable

with OTP)

Pup

Clk & Data

(Manchester)

Clk & Data

(Manchester)

CAN mode

Additionally, the normal MCU communication mode is improved to require less computational

power on the MCU side:

•

SIO1_N is by default high (always output driving the pad high instead of communicating

input/output like SIO1_P). This will help to correctly sample the data on the posedge of

SIO1_N clock avoiding spurious posedge transitions at the start of the device answer.

•

Device will wait 5 µs before to start an answer. This will leave more time to the MCU to

reconfigure the interface direction.

The typical data rate is 2.4 Mbps.

The minimum break time between two consecutive telegrams sent by the MCU is 2 bits.

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