M24SR 데이터 시트보기 (PDF) - STMicroelectronics

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M24SR

Dynamic NFC/RFID tag IC with 2-Kbit EEPROM, NFC Forum Type 4 Tag and I²C interface

STMicroelectronics 

Signal descriptions

2

Signal descriptions

M24SR02-Y

2.1

Serial clock (SCL)

This input signal is used to strobe all data in and out of the device. In applications where this

signal is used by slave devices to synchronize the bus to a slower clock, the bus master

must have an open drain output, and a pull-up resistor must be connected from Serial clock

(SCL) to VCC. (Figure 17 indicates how the value of the pull-up resistor can be calculated).

In most applications, though, this method of synchronization is not employed, and so the

pull-up resistor is not necessary, provided that the bus master has a push-pull (rather than

open drain) output.

2.2

Serial data (SDA)

This bidirectional signal is used to transfer data in or out of the device. It is an open drain

output that may be wire-OR'ed with other open drain or open collector signals on the bus. A

pull-up resistor must be connected from Serial data (SDA) to VCC. (Figure 17 indicates how

the value of the pull-up resistor can be calculated).

2.3

Antenna coil (AC0, AC1)

These inputs are used to connect the device to an external coil exclusively. It is advised not

to connect any other DC or AC path to AC0 or AC1.

When correctly tuned, the coil is used to access the device using NFC Forum Type 4

commands.

2.4

Ground (VSS)

VSS, when connected, is the reference for the VCC supply voltage for all pads, even AC0

and AC1.

2.5

Note:

2.5.1

Supply voltage (VCC)

This pin can be connected to an external DC supply voltage.

An internal voltage regulator allows the external voltage applied on VCC to supply the

M24SR02-Y.

Operating supply voltage VCC

Prior to selecting the M24SR02-Y and issuing instructions to it, a valid and stable VCC

voltage within the specified [VCC(min), VCC(max)] range must be applied. To maintain a

stable DC supply voltage, it is recommended to decouple the VCC line with suitable

capacitors (usually of the order of 10 nF and 100 pF) close to the VCC/VSS package pins.

This voltage must remain stable and valid until the end of the transmission of the instruction

and, for a writing instruction (UpdateBinary, ChangeReferenceData,

12/90

DocID025386 Rev 10

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