AMIS-53050 Datasheet, PDF (40/107 Pages) AMI SEMICONDUCTOR – Frequency Agile Transceiver

AMIS-53050 Frequency Agile Transceiver
Data Sheet
6.1.4.5. Interface Options
Table 16: I²C Address Auto Increment
Register
Number (HEX) Name
Function
Bits
0X0C
0X47
General options A
3
Analog test mode
4
Disable the internal pull up resistors on SDATA and SSN lines
I²C Auto increment disable*
*Note: To write to this register, the test registers must be unlocked by writing a special code to the UNLOCK KEY register (0X40).
6.1.4.6. Pull- Up Disable
The AMIS-53050 includes built in pull-up resistors for use with the I²C operation, in order to reduce the overall system component
count. The pull ups are asserted at POR until mode selection occurs. If the mode is determined to be 3-wire, the pull-up resistors are
removed. If the mode is determined to be I²C, this option bit determines whether the pull-up resistors are to be removed.
6.2 Command Register
The AMIS-53050 provides for single writes to an on-chip 8-bit register, in order to select different operating modes. It is very important
to note that all registers associated with the desired mode are to be pre-programmed, for the single write to this register to operate
correctly.
The command register allows for the user application to issue a single write command to the device, in order to initiate the functions
listed in Table 17. Once a function is initiated, the AMIS-53050 uses the register values associated with the selected function to perform
the desired operation(s). These register values will be the default values or the values the user application has written to the registers
before the function is called out in the command register. Most of the register values can be stored in the integrated EE memory so that
the transceiver can be powered up in the desired configuration.
Table 17: Command - 0X00 [0]
Bit
Command
[7:4] [3:0]
0000
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1111
Stand-by
Receive
Transmit
Idle
Idle Return
Write EE
Read EE
Calibrate QS Osc
Calibrate RC
Calibrate PLL
Calibrate LNA
ROM2Regs
Global Reset
[7:6] [5:0]
01
XXXXXX
100000
Single ADC
Conversion
11
XXXXXX
100000
Continuous ADC
Conversions
Comment
Put the part into stand-by
Put the part into receive mode
Put the part into transmit mode
Put the part into idle mode
Use to return to idle after interrupt for HK or receive during sniff
Write the content of the working registers into EE
Read the contents of the EE
Calibrates the Quick Start oscillator
Calibrates the 10kHz RC oscillator
Calibrates the PLL
Calibrates the LNA matching
Write the content of the ROM into the shadow registers
Resets the part completely
Do an ADC one time on the channel selected loop filter output
Do an ADC on the channel selected continuously loop filter output
With reference to Table 17, stand-by mode can be classified as either a low power mode (where all internal circuitry except for the
control bus interface are disabled), or a clock-only mode (where the crystal oscillator will be enabled to continue providing a system
clock for an external microprocessor). A bit available in the general options A register allows for selection of power-down or clock-only
operation.
Many of the instructions are finite in duration. In this case, the AMIS-53050 will return to the stand-by mode at the completion of the
task. Other instructions such as receive or transmit are indefinite in length and user-controlled, hence to return to the stand-by state, the
transceiver waits for the stand-by instruction.
AMI Semiconductor – Jan. 07, M-20639-002
40
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