MB91F522DKBPMC datasheet(225/280 Pages) CYPRESS

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Document Number: 002-04662 Rev. *F

Page 225 of 280

MB91520 Series

18. Errata

This section describes the errata for the MB91520 Series. Details include errata trigger conditions, scope of impact, available

workarounds, and silicon revision applicability. Contact your local Cypress Sales Representative if you have questions.

Part Numbers Affected

Part Number

MB91F522B/D/F/J/K/L

MB91F523B/D/F/J/K/L

MB91F524B/D/F/J/K/L

MB91F525B/D/F/J/K/L

MB91F526B/D/F/J/K/L

MB91F522/3/4/5/6 Qualification Status

Product Status: Production

Errata Summary

The following table defines the errata applicability to available MB91520 Series devices.

Items

Part Number

Silicon

Revision

Fix Status

[1]. Power-on Conditions is not enough

in the Datasheet Specification

MB91F522B/D/F/J/K/L

MB91F523B/D/F/J/K/L

MB91F524B/D/F/J/K/L

MB91F525B/D/F/J/K/L

MB91F526B/D/F/J/K/L

B, C

Will be fixed in production

silicon version D, E

[2]. Limitation for Watch mode (power

off)

B, C, D, E

Power-on Conditions is not enough in the Datasheet Specification

■ Problem Definition

If the Power-On-Reset and Internal Low Voltage Detection are not generated, some port functions will not be available.

■ Parameters Affected

tOFF for Power off time on Power-on Conditions

VCC Power ramp rate on Power-on Conditions

■ Trigger Condition

When the power supply voltage to the MCU has been turned off but has not reached 0 V when the power supply voltage

is turned on again, MCU does not generate an internal power-on-reset signal (Power-On reset or Internal LVD reset).

Then, some port functions will not be available.

If below condition (1) or (2) or (3) is satisfied, Power-On Reset (Initialization-Reset signal) is generated and no problem

occurs.

(1) The VCC voltage is less than 200 mV for 50 ms or longer (tOFF)

(2) VCC Power ramp rate less than 4 mV/µs (dV/dt) until a voltage level for a safe Power-On detection is reached

(3) C-pin voltage is below 60 mV when VCC is turned on again

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