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RF6001
Rev A3 DS050929
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Part of the POLARIS™ TOTAL RADIO™ Solution
Serial Data Interface and Device Control
A three wire serial data interface allows user programming of the internal control registers in the RF6001. The serial data inter-
face consists of the serial select (SSB), serial data in (SDI) and serial clock (SCLK) pins. The lock detect/test out (LDTO) pin is
by default configured as an output from the serial interface, but may be used to monitor various internal PLL signals, as well.
The serial interface contains a set of 32 18-bit registers that are individually accessed by 6-bit addresses.
The figure below shows a timing diagram for a serial transfer to the RF6001 serial data interface. Refer to the Electrical Speci-
fications for the timing margin requirements. The SSB pin is normally high. A serial transfer is initiated by taking SSB low. The
address and data bits on the SDI pin are shifted in on rising edges of the SCLK pin, MSB first. The data is latched and changes
take effect on the falling edge of the clock pulse corresponding to the last (18th) data bit in the addressed register. If the trans-
fer is interrupted, such that the 18th data bit clock pulse does not occur, then no data is written to the register.
Data may be written to the registers in two ways: one register per serial transfer, or several sequential (adjacent) registers per
serial transfer. These actions are illustrated in the following figure.
The serial interface provides the capability of reading from the registers. If a register is written while the TEN SDI bit is set to
zero, then the previous contents of that register will be serially shifted out on the LDTO pin.
The following table illustrates the RF6001 Register Map. A serial transfer is initiated on the falling edge of SSB, and serial data
is shifted in MSB first, starting with the register address and then the data.
The RESET opcode (011111) is unique in that once the 011111 opcode is written, the RF6001 is reset, and held in reset until
the SSB pin is taken high. It is recommended to reset the RF6001 upon initial power-up of the system by writing the 011111
serial interface opcode. This ensures that the part will start up with the default register settings and that it will not be drawing
current unless enabled.
SSB
SCLK
SDI
Tcwh
Tcwl
Th
Tcs
Tsu
addr(5)
addr(4)
addr(0)
MSB
LSB
...
...
...
...
...
...
Tcs Tcs
Serial Write,
single address
data17
data16
data2
data1
data0
addr5
addr4
addr1
addr0
data17
data16
data15
data2
data1
data0
SSB
SDI
SCLK
LDTO
address is automatically
incremented to load
the next register
Serial Write,
multiple, sequential addresses
addr5
addr4
addr1
addr0
data17
data16
data15
data2
data1
data0
data17
data16
data15
data2
data1
data0
data17
data16
data2
data1
data0
data17
data16
data2
data1
data0
SDI
SCLK
SSB
LDTO
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