M41ST87YSS6F datasheet(20/54 Pages) STMICROELECTRONICS

部件名	M41ST87YSS6F

功能描述	5.0 and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

PDF	54 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

20 / 54 page

Operating modes

M41ST87W

20/54

DocID9497 Rev 11

Table 4: Tamper detection truth table

Option

Mode

TCMX

TPMX

Normally open/tamper to GND

(1)

Normally open/tamper to VOUT

(1)

III

Normally closed/tamper to GND

Normally closed/tamper to VOUT

Notes:

(1)

No battery current drawn during battery backup.

Figure 15: Basic tamper detect options

Available in SOX28 package only.

Figure 16: Tamper detect output options

Available in SOX28 package only.

TAMPER LO,

NORMALLY OPEN

TAMPER HI,

NORMALLY, CLOSED

User

Configuration

TCM

X, TPMX

IRQ - Interrupt the

processor on tamper

CLR - Clearexternal

RAM on tamper(1)

CLR - Clear internal

RAM on tamper

Time stamp tamper

event

CLRX

EX T

TIE

CLRX

TAMPER HI,

NORMALLY OPEN

TAMPER LO,

NORMALLY CLOSED

Triggering Event

Tamper Event Output

TCMX, TPMX = 1,1

TCMX, TPMX = 0,0

TCMX, TPMX = 1,0

TCMX, TPMX = 0,1

VCC (VOUT)

IRQ - Interrupt the

processor on tamper

User

Configuration

TPCLR - Clear external

RAM on tamper (1)

RESET OUT

CLR - Clear 128 bytes

internal RAM on tamper

Time stamp tamper

event (to RTC)

CLR1 EXT

TIE1

CLR1

CLR2 EXT

TIE2

CLR2

(other reset sources)

TEB2

TP2

TEB1

TP1

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