CC400 Chipcon, CC400 Datasheet - Page 8

• Manufacturer Part Number: CC400
• Description: Single Chip High Performance RF Reansceiver
• Manufacturer: Chipcon

3-wire Serial Interface
CC400
interface (STROBE, PDATA and CLOCK).
A full configuration of
sending 8 data frames of 16 bits each.
With a clock rate of 2 MHz the time
needed
therefore be less than 100 µs. Setting the
device in power down mode requires
sending one frame only and will therefore
take less than 10 µs.
In each write-cycle 16 bits are sent on the
PDATA-line. The three most significant
bits of each data frame (bit15, bit14 and
bit13) are the address-bits. Bit15 is the
MSB of the address and is sent as the first
bit. See figure 3.
Chipcon AS
CLOCK
PDATA
STROBE
CLOCK
PDATA
STROBE
is programmed via a simple 3-wire
0 0 0
for
Address
first
frame
(000)
M
S
B
a
BIT 1
full
Data
first
frame
Figure 3. Serial data transfer (full configuration).
SmartRF
Figure 4. Timing diagram, serial interface.
configuration
CC400
TM
T
CC400
SD
L
S
B
Address
second
frame
(001)
0 0 1
requires
T
T
HD
CS
M
S
B
BIT 0
will
Data
second
frame
Datasheet (rev. 3.1) 2003-11-12
T
S,min
SmartRF
A timing diagram for the programming is
shown in figure 4. The clocking of the data
on PDATA is done on the negative edge
of CLOCK. When the last bit, bit0, of the
sixteen
STROBE-pulse must be brought high and
then low to load the data.
The configuration data will be valid after a
programmed power-down mode, but not
when the power-supply is turned off.
When changing mode, only the frames
that are different need to be programmed.
The timing specifications are given in table
1.
T
L
S
B
SC
0 1 1
bits
T
BIT 15
CL,min
L
S
B
has
1 1 1
Address
last
frame
(111)
M
S
B
®
been
T
CH,min
CC400
Data
last
frame
loaded,
Page 8 of 27
BIT 14
L
S
B
the