CC400-RTR2 datasheet(11/31 Pages) TI

11 / 31 page

CC400

SWRS050

Page 11 of 32

14.

3-wire Serial Interface

CC400 is programmed via a simple 3-wire

interface (STROBE, PDATA and CLOCK).

A full configuration of

CC400 requires

sending 8 data frames of 16 bits each.

With a clock rate of 2 MHz the time

needed for a full configuration will

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 4.

A timing diagram for the programming is

shown in Figure 5. The clocking of the

data on PDATA is done on the negative

edge of CLOCK. When the last bit, bit0, of

the sixteen bits has been loaded, the

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 10.

CLOCK

PDATA

STROBE

000

00 1

11 1

01 1

Address

first

frame

(000)

Data

first

frame

Address

last

frame

(111)

Data

last

frame

Address

second

frame

(001)

Data

second

frame

Figure 4: Serial data transfer (full configuration).

CLOCK

STROBE

PDATA

BIT 0

BIT 1

BIT 15

BIT 14

TSD

THD

TCS

TSC

TS,min

TCL,min

TCH,min

Figure 5: Timing diagram, serial interface.

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