Hardware description

UM2053

6/10

DocID029206 Rev 1

1.2

Using RF disable (DIS) pin

This active high 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 disable the RF communication.

In Dual interface mode, the DIS pin must not be left floating.

1.3

Using General Purpose Output (GPO) pin

This configurable output signal is used either to indicate that the M24SR64-Y is executing

an I2C or RF session in the mode chosen by the user. It is an open drain output and a

pull-up resistor (20 kΩ) must be connected between GPO and VCC pins. This digital output

pin is easily accessible to the user on the GPO test point.

1.4

Using I2C pins

The memory is accessible through I2C when it is powered by the VCC pin. I2C clock and

data signals are respectively available on SCL and SDA test points. Since I2C is an open

drain interface, pull up resistors have to be connected from both lines to VCC pin.