M24SR64-Y datasheet(13/90 Pages) STMICROELECTRONICS

13 / 90 page

DocID023790 Rev 19

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M24SR64-Y

Signal descriptions

EnableVerificationRequirement, DisableVerificationRequirement, EnablePermanentState,

DisablePermanentState, until the completion of the internal I²C write cycle (tW).

2.5.2

Power-up conditions

When the power supply is turned on, VCC rises from VSS to VCC. The VCC rise time must not

vary faster than 1V/µs.

2.5.3

Device reset in I²C mode

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

circuit is included. At power-up (continuous rise of VCC), the M24SR64-Y does not respond

to any I²C instruction until VCC has reached the power-on reset threshold voltage (this

threshold is lower than the minimum VCC operating voltage defined). When VCC passes

over the POR threshold, the device is reset and enters the Standby power mode. However,

the device must not be accessed until VCC has reached a valid and stable VCC voltage

within the specified [VCC(min), VCC(max)] range.

In a similar way, during power-down (continuous decrease in VCC), as soon as VCC drops

below the power-on reset threshold voltage, the M24SR64-Y stops responding to any

instruction sent to it.

2.5.4

Power-down conditions

During power-down (continuous decay of VCC), the M24SR64-Y must be in Standby power

mode (mode reached after decoding a Stop condition, assuming that there is no internal

operation in progress).

2.6

RF disable

This input signal is used to disable the RF communication. When the voltage on the VCC pin

is below the POR level or not connected, an internal pull-down resistor is connected on this

pad. Thus, the RF disable pad is maintained to the low level and the RF analog front end is

activated. When the voltage on the VCC pin is higher than the POR level, the I²C host shall

set this pin to enable or disable the RF communication. In Dual interface mode, RF disable

must not be left floating.

2.7

General purpose output (GPO)

The GPO pad is an open drain pad and a external pull-up resistor shall be connected to it.

This pad is a configurable output signal. On delivery, GPO is configured as Session opened.

Its behavior is consistent with the I2C or RF session activated and with the mode chosen by

the user. The GPO pad is enable when an RF or an I2C session is open. When neither an

RF nor an I2C session is open, the GPO is high impedance.

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