AMIS-52150 Datasheet, PDF (8/21 Pages) AMI SEMICONDUCTOR – Low-Power Transceiver with Clock and Data Recovery

AMIS−52150
Table 11. I²C BUS DEVICE ADDRESSING
Device
AMIS−52150
Address (Bin)
01101000
AMIS−52150
01101001
HEX
68
69
Function
Device Write
Device Read
Table 12. I²C CONTROL REGISTER
Register (HEX)
Name
Bits
0x0c
I²C Address Increment
2
States
0
1
Comments
Increment after Write
Do Not Increment
The I²CDATA and I²CCLK lines are also used to signal
to an external controller certain internal activities of the
transceiver. The receiver is activated upon detection of RF
energy during Sniff Mode operation. The wake-up timer can
also be configured to wake-up the device in order to alert an
external controller to perform specific tasks, as defined by
the system designer.
TX/RX, Data Input/Output Pin
The transmit/receive (TX/RX) pin can be programmed to
be either an input for RF transmissions, or an output for RF
reception, or the output of the RC oscillator signal, or the
output of the recovered data from the CDR circuits,
respectively.
In transmit mode, this pin is the digital data input to the
AMIS−52150 RF transmit circuit. The digital data results in
the On and Off cycling of the output power amplifier (PA).
The AMIS−52150 does not perform any protocol
conversion on the data bit stream; it is simply a serial bit
stream. The state of the TX/RX pin either turns the output
amplifier On (enabling RF transmission) or turns the output
amplifier Off (disabling RF transmission). The TX/RX
input can be inverted which causes the state control of the RF
output amplifier to be inverted as well.
In receive mode, this pin is the digital data output from the
AMIS−52150 receivers. The received data is recovered as a
high/low (digital ones and zeros) serial bit stream; the
AMIS−52150 does not modify the received data protocol.
The data output state due to the presence of energy in the
receiver can be programmed to be either a high level or a low
level at the TX/RX pin. An external controller is needed to
decode the information in the recovered data bit stream.
When programmed to be an oscillator output, the TX/RX
pin outputs the signal from the RC oscillator. This signal can
be used to monitor the frequency of the RC oscillator in
order to trim the frequency to the desired value.
The TX/RX pin can be programmed to output the
recovered data obtained from the clock and data recovery
circuits. In this case, the device must be programmed in the
CDR mode. More information on CDR will be provided in
a later section of this data sheet.
The functions of the TX/RX port are controlled by the
values of the register settings, as shown in Table 13.
Table 13. TX/RX PIN DEFINITION CONTROL REGISTERS
Register (HEX)
Name
Bits
0x0e
RC OSC on TX/RX
2
0x1e
TX/RX Invert
5
States
0
1
0
1
Comments
RX/TX Normal
RC OSC Output
Normal Levels
Inverted
VDD, Supply Voltage Pin
The VDD pin is the power supply pin for the
AMIS−52150. The voltage on this pin is typically 3.0 V.
Please refer to the section “Operating and Maximum
Specifications” of this document for the VDD operating
conditions.
RFPWR, DC Voltage Output Pin
In the AMIS−52150, a regulated DC voltage is generated
and outputted at the RFPWR pin. This voltage should be fed
through a DC connection to the RFOUT pin in order to
power the output stage of the RF PA. The voltage level is
adjusted based on the value of the register setting, as shown
in Table 14.
Table 14. TX VOLTAGE CONTROL REGISTER
RFPWR Voltage Control Register
Register (HEX)
Name
Bits
0x02
RFPWR Trim
All
Comments
0xff is Highest Power
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