SAP5SD-B-G1-R datasheet(50/67 Pages) RENESAS

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SAP51 / SAP5S Datasheet

January 28, 2016

Figure 5.8

Data Input Voltage Constraints in Safety Mode

As soon as the F-D0* input pad detects an offset level less than VOFL(Max), the SAP5 resets the data input for D1

(F-D1*), signaling an OPEN state at the safety switch connected to D0*. The input data for D3 (F-D3*) will be

reset if F-D2* detects an offset level less than VOFL(Max).

Provided that the offset levels are not missing, the EEPROM bits D1* and D3* are transmitted as data bits D1 and

D3 if swap_flag = ‘0’; otherwise they are swapped.

In order to avoid desynchronization with the safety monitor in case the AS-i master repeats a DEXG call, the

SAP5 will not update the data code word for 224

µs (+16µs) after a DEXG call had been processed.

5.19. Master and Repeater Modes

5.19.1. Master/ Repeater Mode Activation

The SAP5 Master/Repeater Mode functionality is enabled via the Master_Mode EEPROM flag (refer to Table

4.2). In order to activate the Master_Mode, an SAP5 Reset (see section 5.13) must be performed after

programming the EEPROM Master_Mode flag.

For the distinction between Master and Repeater Mode, the ID_Code can be set to a specific value as described

in Table 5.24.

NOTE: The ID_Code must be programmed before activation of the Master_Mode flag. Once the Master_Mode

flag is set to logic high, the slave functionality of the SAP5 is no longer available, preventing any write access to

the EEPROM by use of AS-i master requests as described in section 4.3.

Moreover, the Master and Repeater Mode functionality can be disabled generally by use of a hidden EEPROM

flag. This flag is inaccessible by the user, but can be set during the IDT production test.

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