AT24CSW01X datasheet(11/41 Pages) MICROCHIP

11 / 41 page

Figure 4-1. Bus Timing

SCL

SDA In

SDA Out

HIGH

LOW

BUF

SU.STO

SU.DAT

HD.DAT

HD.STA

SU.STA

4.5

Electrical Specifications

4.5.1

Power-Up Requirements and Reset Behavior

During a power-up sequence, the VCC supplied to the AT24CSW01X/AT24CSW02X should monotonically rise from

GND to the minimum VCC level (as specified in Table 4-1), with a slew rate no faster than 0.1 V/µs.

4.5.1.1

Device Reset

To prevent inadvertent write operations or any other spurious events from occurring during a power-up sequence, the

AT24CSW01X/AT24CSW02X includes a Power-on Reset (POR) circuit. Upon power-up, the device will not respond

to any commands until the VCC level crosses the internal voltage threshold (VPOR) that brings the device out of Reset

and into Standby mode.

The system designer must ensure the instructions are not sent to the device until the VCC supply has reached a

stable value greater than or equal to the minimum VCC level. Additionally, once the VCC is greater than or equal to the

minimum VCC level, the bus host must wait at least tPUP before sending the first command to the device. See Table

4-4 for the values associated with these power-up parameters.

Table 4-4. Power-up Conditions(1)

Symbol

Parameter

Min. Max. Units

tPUP

Time required after VCC is stable before the device can accept commands

100

－

µs

VPOR

Power-on Reset Threshold Voltage

－

1.5

tPOFF

Minimum time at VCC = 0V between power cycles

－

Note:

These parameters are characterized but they are not 100% tested in production.

If an event occurs in the system where the VCC level supplied to the AT24CSW01X/AT24CSW02X drops below the

maximum VPOR level specified, it is recommended that a full power cycle sequence be performed. First, drive the VCC

pin to GND, waiting at least the minimum tPOFF time, and then perform a new power-up sequence in compliance with

the requirements defined in this section.

AT24CSW01X/AT24CSW02X

Electrical Characteristics

and its subsidiaries

Datasheet

DS20006396B-page 11

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