SAP5SD-B-G1-R datasheet(22/63 Pages) ETC2

22 / 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.

22 of 62

E²PROM

3.1. Overview

The SAP5 provides an on-chip E²PROM with typical write and read times according to Table 8.

Table 8: E²PROM Read and Write Times

Symbol

Parameter

Min

Max.

Unit

Note

tread_init

Initialization readout time

50.0

s

twrt_adra1

Write time after ADRA master request

38.0

twrt_adra2

Write time after ADRA master request

12.5

twrt_wid1u

Write time after WID1 master request

(user access)

38.0

twrt_wid1m

Write time after WID1 master request

(manufacturer access)

25.0

twrt_prgm

Single cell write time

12.5

1 Time includes readout of the configuration block. Running in Safety Mode, the User/Firmware Area and the

Safety Area will be read out in parallel.

2 the Lock_EE_PRG flag is set

3 the Lock_EE_PRG flag is not yet set

4 concerns the programming of data in both Firmware Area and Safety Area

For security reasons the memory area is structured in three independent data blocks and a single

configuration block containing the Security_Flag. The data blocks are named User Area, Firmware Area and

Safety Area.

The Firmware Area contains all manufacturing related configuration data (i.e. selection of optional features,

ID codes, …). It can be protected against undesired data modification by setting the Lock_EE_PRG flag to ‘1’.

The User Area contains only such data that is relevant for changes at the final application (i.e. field installation

of slave module). Because the environment where modifications of the user data may become necessary can

sometimes be rough and unpredictable, additional security was added to the programming of the User Area,

ensuring a write access cannot result in an undetected corruption of E²PROM data.

The Safety Area contains the cryptographic code table for the Safety Mode.

The E²PROM cells in User Area, Firmware Area and Safety Area have a word width of 6 bit. The sixth bit is

not shown in Table 9 and Table 11. The sixth bit of each cell represents the odd parity of the respective data

word, providing an additional data security mechanism. The programming of the parity bit is performed

automatically during the E²PROM write process and cannot be influenced by the user. Each E²PROM read

process – particularly during initialization of the SAP5 – involves an evaluation of the parity bits. In case a

wrong parity bit was found in the User Area, the entire User Area data is treated as corrupted. The IC returns

to Slave Address “0” and the ID_Code as well as the IO_Code are set to 0xF. In case a false parity bit was

found in one or more cells of the Firmware Area or the Safety Area, the status register bit S1 will be set (=’1’),

signaling the same state as the input PFAULT would be set (refer to chapter 4.16 page 46).

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