M24LR04E-R datasheet(14/142 Pages) STMICROELECTRONICS

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Description

M24LR04E-R

14/142

Doc ID 022208 Rev 5

using the 1/256 pulse coding mode or a data rate of 26 Kbit/s using the 1/4 pulse coding

mode.

Outgoing data are generated by the M24LR04E-R load variation using Manchester coding

with one or two subcarrier frequencies at 423 kHz and 484 kHz. Data are transferred from

the M24LR04E-R at 6.6 Kbit/s in low data rate mode and 26 Kbit/s high data rate mode. The

M24LR04E-R supports the 53 Kbit/s fast mode in high data rate mode using one subcarrier

frequency at 423 kHz.

The M24LR04E-R follows the ISO 15693 and ISO 18000-3 mode 1 recommendation for

radio-frequency power and signal interface.

The M24LR04E-R provides an Energy harvesting mode on the analog output pin Vout.

When the Energy harvesting mode is activated, the M24LR04E-R can output the excess

energy coming from the RF field on the Vout analog pin. In case the RF field strength is

insufficient or when Energy harvesting mode is disabled, the analog output pin Vout goes

into high-Z state and Energy harvesting mode is automatically stopped.

The M24LR04E-R features a user configurable digital out pin RF WIP/BUSY that can be

used to drive a micro controller interrupt input pin (available only when the M24LR04E-R is

correctly powered on the Vcc pin).

When configured in the RF write in progress mode (RF WIP mode), the RF WIP/BUSY pin is

driven low for the entire duration of the RF internal write operation. When configured in the

RF busy mode (RF BUSY mode), the RF WIP/BUSY pin is driven low for the entire duration

of the RF command progress.

The RF WIP/BUSY pin is an open drain output and must be connected to a pull-up resistor.

Figure 2.

8-pin package connections

See Section 30 for package dimensions, and how to identify pin-1.

Table 1.

Signal names

Signal name

Function

Direction

Vout

Energy harvesting Output

Analog output

SDA

Serial Data

I/O

SCL

Serial Clock

Input

AC0, AC1

Antenna coils

I/O

VCC

Supply voltage

RF WIP/BUSY

Digital signal

Digital output

VSS

Ground

SDA

VSS

SCL

RF WIP/BUSY

AC0

Vout

VCC

MS19742V1

AC1

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