Signal descriptions M24LR16E-R
16/148 DocID018932 Rev 14
2.6 V
SS
ground
V
SS
is the reference for the V
CC
supply voltage and Vout analog output voltage.
2.7 Supply voltage (V
CC
)
This pin can be connected to an external DC supply voltage.
Note: An internal voltage regulator allows the external voltage applied on V
CC
to supply the
M24LR16E-R, while preventing the internal power supply (rectified RF waveforms) to output
a DC voltage on the V
CC
pin.
2.7.1 Operating supply voltage V
CC
Prior to selecting the memory and issuing instructions to it, a valid and stable V
CC
voltage
within the specified [V
CC
(min), V
CC
(max)] range must be applied (see Table 119). To
maintain a stable DC supply voltage, it is recommended to decouple the V
CC
line with a
suitable capacitor (usually of the order of 10 nF) close to the V
CC
/V
SS
package pins.
This voltage must remain stable and valid until the end of the transmission of the instruction
and, for a Write instruction, until the completion of the internal I²C write cycle (t
W
).
2.7.2 Power-up conditions
When the power supply is turned on, V
CC
rises from V
SS
to V
CC
. The V
CC
rise time must not
vary faster than 1V/µs.
2.7.3 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 V
CC
), the device does not respond to any
I²C instruction until V
CC
has reached the power-on reset threshold voltage (this threshold is
lower than the minimum V
CC
operating voltage defined in Table 119). When V
CC
passes
over the POR threshold, the device is reset and enters the Standby power mode. However,
the device must not be accessed until V
CC
has reached a valid and stable V
CC
voltage
within the specified [V
CC
(min), V
CC
(max)] range.
In a similar way, during power-down (continuous decrease in V
CC
), as soon as V
CC
drops
below the power-on reset threshold voltage, the device stops responding to any instruction
sent to it.
2.7.4 Power-down conditions
During power-down (continuous decay of V
CC
), the device must be in Standby power mode
(mode reached after decoding a Stop condition, assuming that there is no internal write
cycle in progress).
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