SAP5SD-B-G1-R datasheet(45/63 Pages) ETC2

45 / 63 page

SAP5S / SAP51

Universal Actuator-Sensor Interface IC

Data Sheet

July 17, 2012

the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to

changes without notice.

45 of 62

4.14. UART

The UART performs a syntactical and timing wise analysis of the received telegrams at the AS-i input channel.

It converts the pulse coded AS-i input signal into a Manchester-II-coded bit stream and provides the receive

In Master/Repeater Mode the output signal of the Manchester coder (AS-i pulse to MAN signal conversion) is

resynchronized and forwarded to pin LED1. Any pulse timing jitters of the received AS-i signal become

removed, as long as they stay within the specified maximum limits. If the received AS-i telegram does not

pass one of the different error checks (see detailed description below), the LED1 output the output becomes

inactive for a certain time periode, see chapter 4.19.3.

The comparator stages at the AS-i-line receiver generate two pulse-coded output signals (p_pulse, n_pulse)

disjoining the positive and negative telegram pulses for further processing. To reduce UART sensitivity on

erroneous spike pulses, pulse filters suppress any p_pulse, n_pulse activity of less than 750 ns width. After

filtering, the p_pulse and n_pulse signals are checked in accordance with the AS-i Complete Specification for

following telegram transmission errors:

Start_bit_error

The initial pulse following a pause must have negative polarity. Violation of this rule is

detected as Start_bit_error. The first pulse is the reference for bit decoding. The first

bit detected shall be of the value 0.

Alternating_error

Two consecutive pulses must have different polarity. Violation of this rule is detected

as Alternating_error.

Note: A negative pulse shall be followed by a positive pulse and vice versa.

Timing_error

Within any master request or slave response, the digital pulses that are generated by

the receiver are checked to start in periods of

after the start of the

initial negative pulse, where n = 1 ... 26 for a master request and n = 1 ... 12 for a

slave response. Violation of this rule is detected as Timing_error.



500

875

)

(





Note: There is a certain pulse timing jitter associated with the receiver output signals

(compared to the analog signal waveform) due to sampling and offset effects at the

comparator stages. In order to take the jitter effects into account, the timing tolerance

specifications differ slightly from the definitions of the AS-i Complete Specification.

No_information_error

Derived from the Manchester-II-Coding rule, either a positive or negative pulse shall

be detected in periods of

after the start of the initial negative pulse,

where n = 1 ... 13 for a master request and n = 1 ... 6 for a slave response. Violation of

this rule is detected as No_information_error.



500

875

)

(





Note: The timing specification relates to the receiver comparator output signals. There

is a certain pulse timing jitter in the digital output signals (compared to the analog

signal waveform) due to sampling and offset effects at the comparator stages. In order

to take the jitter effects into account, the timing tolerance specifications differ slightly

from the definitions of the AS-i Complete Specification.

Parity_error

The sum of all information bits in master requests or slave responses (excluding start

and end bits, including parity bit) must be even. Violation of this rule is detected as

Parity_error.

End_bit_error

The pulse to be detected

after the start pulse shall be of positive

polarity, where n = 13 (78

s) for a master request and n = 6 (36 s) for a slave

response. Violation of this rule shall be detected as an End_bit_error.



500

875

)

(





Note: This stop pulse shall finish a master request or slave response.

Length_error

Telegram length supervision is processed as follows. If during the first bit time after

the end pulse of a master request (equivalent to the 15

th Bit time) for synchronized

slaves (during the first three bit times for not synchronized slaves, equivalent to the Bit

times 15 to 17) or during the first bit time after the end pulse of a slave response

(equivalent to the 8

Bit time) a signal different from a pause is detected, a

Length_error is detected.

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