M95010-R datasheet(9/43 Pages) STMICROELECTRONICS

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M95040, M95020, M95010

Signal description

Doc ID 6512 Rev 8

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2.6

Write Protect (W)

This input signal is used to control whether the memory is write protected. When Write

Protect (W) is held low, writes to the memory are disabled, but other operations remain

enabled. Write Protect (W) must either be driven high or low, but must not be left floating.

2.7

VSS ground

VSS is the reference for the VCC supply voltage.

2.8

Supply voltage (VCC)

2.9

Supply voltage (VCC)

2.9.1

Operating supply voltage VCC

Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage

within the specified [VCC(min), VCC(max)] range must be applied (see Table 8, Table 9 and

Table 10). This voltage must remain stable and valid until the end of the transmission of the

instruction and, for a Write instruction, until the completion of the internal write cycle (tW). In

order to secure a stable DC supply voltage, it is recommended to decouple the VCC line with

a suitable capacitor (usually of the order of 10 nF to 100 nF) close to the VCC/VSS package

pins.

2.9.2

Device reset

In order to prevent inadvertent write operations during power-up, a power-on-reset (POR)

circuit is included. At power-up, the device does not respond to any instruction until VCC

reaches the internal reset threshold voltage (this threshold is defined in Table 8, Table 9 and

Table 10 as VRES).

When VCC passes over the POR threshold, the device is reset and is in the following state:

●

in Standby Power mode

●

deselected (note that, to be executed, an instruction must be preceded by a falling

edge on Chip Select (S))

●

Status register value:

–

the Write Enable Latch (WEL) is reset to 0

–

Write In Progress (WIP) is reset to 0

–

The SRWD, BP1 and BP0 bits remain unchanged (non-volatile bits)

When VCC passes over the POR threshold, the device is reset and enters the Standby

Power mode. The device must not be accessed until VCC reaches a valid and stable VCC

voltage within the specified [VCC(min), VCC(max)] range defined in Table 8, Table 9 and

Table 10.

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