AMIS-52000 Datasheet, PDF (5/15 Pages) AMI SEMICONDUCTOR – Single-Chip Radio Transceiver

AMIS-52000 Single-Chip Radio Transceiver
Data Sheet
7.0 Pin Descriptions
RX1, RX2, RF Inputs
RX1 and RX2 are RF antenna inputs to the AMIS-52000. The
internal design of these circuits is identical. Each internal
circuit can be trimmed to compensate for device process
tolerances and external component tolerances. The first
stage of the RF input is an LNA (Low Noise Amplifier). The
receiver uses a low IF frequency and internal filters. The
two inputs are “summed” before the data recovery circuit.
The receiver uses an RSSI (Receive Signal Strength Indication)
to recover the ASK/OOK (Amplitude Shift Keyed/On Off Shift
Keyed) modulated data.
The receiver is controlled by writing to the internal registers
of the AMIS-52000:
Table 10: Pin Descriptions
Register
Register
0x05
Register
0x0F
Register
0x17
&
Register
0x05
RX1 or RX2 Receiver Control (Registers 0x05, 0x0F and 0x17)
Bit
Bit Name
Bit State Comments
0
Antenna
0
Receive circuits (RX1) are off
#1 Enable
1
Receive circuits (RX1) are controlled by Bit 3
1
Antenna
0
Receive circuits (RX2) are off
#2 Enable
1
Receive circuits (RX2) are controlled by Bit 3
3
RX Enable
0
Receiver is disabled (off)
1
Receiver is enabled (on)
53
Continuous 0
Normal operation
RX
1
RF receiver is turned on
Register
000
Set Data filter to 1.1kHz
0x17
Data Rate
001
Set Data filter to 2.3kHz
Bit 6 & 7 Cntl
010
Set Data filter to 5.2kHz
011
Set Data filter to 10.4kHz
Register BIT Order
100
Set Data filter to 1.18kHz
0x05
Bit 7 msb
101
Set Data filter to 2.57kHz
Bit 2
Bit 2 lsb
110
Set Data filter to 7.0kHz
111
Set Data filter to 20.45kHz
TX/RX, Data Input/Output
The TX/RX pin (in transmit operation) is the digital data
input to the AMIS-52000’s transmit circuits. The data is used
to turn the transmitter on or off. The AMIS-52000 does not
perform protocol conversion to the data. It simply transmits
when transmission is enabled. The state (low input or high
input) that causes the AMIS-52000 to transmit is
programmable.
The TX/RX pin (in receive) is the digital data output from
the AMIS-52000 receiver. The received data is formed into
high and low signals (ones and zeros) in a serial bit stream.
The data output state (pin TX/RX) produced by the AMIS-
52000 receiver due to the presence of RF energy at the RX
input can be programmed to be either a high level or a low
level. An external controller must recreate the actual
information.
The TX/RX pin (can be programmed to be the oscillator
output) is the RC oscillator frequency. An external test
system can use this signal in a feedback loop to trim the RC
oscillator frequency.
The TX/RX pin (during the Sniff or signal capture period) is
an indicator (to a host controller) output that either the
AMIS-52000 receiver has detected RF energy when the
device is powered down with Sniff Mode enabled or the
internal housekeeping timer has expired. When TX/RX is
used in this mode the I²C data line will be high when RF
energy is detected or low when the housekeeping timer
activates the device. Depending on the bit period time, this
acquisition could occur on the first bit of data and still
receive the bit or it may require a pre-amble. The following
timing chart shows the function of this pin in signal
acquisition and Sniff Modes.
AMI Semiconductor - Confidential
www.amis.com
5