AMIS-52150 Datasheet, PDF (19/21 Pages) AMI SEMICONDUCTOR – Low-Power Transceiver with Clock and Data Recovery

AMIS−52150
Registers
The AMIS−52150 is comprised of 31 registers.
Power-on-Reset/Brown-out Detection
The POR/brown-out detection circuit ensures that the
AMIS−52150 will be in a reset state when VDD drops below
a certain threshold voltage, and remains in this state until
VDD rises above another threshold voltage. The
characteristics of the POR circuit are shown in Figure 17.
Figure 17. Power-on-Reset Characteristics
Alternative Wake-up Functions
Figure 18. Wake-up Circuits
The AMIS−52150 will wake up from the low power mode
upon a) reception of RF energy, b) an interrupt generated by
the wake-up timer, or c) an interrupt generated by the
external controller. In this low power mode, the RF circuits,
the crystal oscillator, and the CLKOUT circuits are shut off,
and only the RC oscillator and the wake-up divider circuitry
are active. Once the AMIS−52150 receiver detects RF
energy and wakes up, the RX/TX pin is set “low” while the
I²CDATA and I²CCLK pins can remain “high”. In addition,
when the wake-up timer wakes up the AMIS−52150 to in
turn flag the external controller, the TX/RX and I²CDATA
pins are set “low” while the I²CCLK pin can remain “high”.
The external controller can also signal the AMIS−52150 to
wake up by setting both the I²CDATA and I²CCLK lines
low. These functions are shown in Table 25.
Table 25. WAKE-UP TRUTH TABLE
Wake-up Source
TX/RX
SNIFF
0
HK Cycle
0
External
1
I²C DATA
1
0
0
I²CCLK
1
1
0
CLKOUT
XTAL Out
RC Oscillator
Don’t Care
Comments
Wake on RF Energy Detect
Wake due to HK Timer Timeout
Wake due to External Controller
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