TLC320AD50CSLASHI datasheet(30/54 Pages) TI2

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3–3

3.2.1

Hardware Secondary Serial Communication Request

The FC requests a secondary communication when it is asserted. The FC terminal is latched at the rising edge of

FS (primary communication), so FC should be pulled high before the rising edge of the primary frame sync (FS).

Figures 3–3 and 3–4 show the FS output from a master device.

ADC Data Out

DOUT

DIN

Read/Write

ADC Data Out

DAC Data In

Read/Write

DAC Data In

Secondary

Request

No Secondary

Request

Figure 3–3. FS Output When Hardware Secondary Serial Communication Is Requested Only Once

(No Slave)

(Master)

(See Note)

MS1

NOTE: FC of master device and slave devices should connect together.

Figure 3–4. FS Output When Hardware Secondary Serial Communication Is Requested Only Once

(Three Slaves)

3.2.2

Software Secondary Serial Communication Request

The LSB of the DAC data within a primary transfer can request a secondary communication when the device is in

the 15-bit mode.

For all serial communications, the most significant bit is transferred first. For a 16-bit ADC word and a 16-bit DAC word,

D15 is the most significant bit and D0 is the least significant bit. For a 15-bit DAC data word in a primary

communication, D15 is the most significant bit and D1 is the least significant bit. Bit D0 is then used for the secondary

communication request control. All digital data values are in 2s complement data format (Figure 3–5).

If the data format is set to the 16-bit word mode, all 16 bits are either ADC or DAC data and secondary communication

can then be requested only by hardware (FC terminal).

Data (D0 = 1)

DIN

Read/Write

Data (D0 = 0)

Secondary Communication Request

No Secondary Communication Request

NOTE: See Figure 3–8 for secondary communication DIN data format.

Figure 3–5. FS Output During Software Secondary Serial Communication Request (No Slave)

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