Motorola MCU 68HC912 Manual de usuario descargar pdf (Pagina 5)

SLAA108A

SPI-Based Data Acquisition/Monitor Using the TLC2551 Serial ADC 5

TLV5616 Serial Interface

The TLV5616 is a 12-Bit voltage output digital-to-analog converter (DAC) with a serial interface.

When the device is enabled - /CS held low – a falling edge of frame sync starts shifting data to

the internal register. The input data format is a 16-bit serial string which contains four control

and 12 data bits.

Table 2. I/O Pins of the TLV5616

Pin Description

DIN Serial input data – 16-Bit format, first 4 MSB’s are control bits, followed by 12 data bits

SCLK Serial input clock

/CS Chip select – An active low signal used to enable and disable inputs

Frame sync – This pin is used in DSP based systems to synchronize data transfers. In

microcontroller systems, this pin can be used as chip select

AGND Analog ground

REFIN Reference analog voltage

OUT DAC analog output voltage

Analog supply voltage (2.7-5.5VDC)

The TLV5616 uses a 16-bit data format with the first four MSB’s containing device programming

information, followed by the 12-bits of serial data to be converted. Data bit D14 controls the

conversion speed, while D13 provides a software power down. Setting D14 puts the device in

fast conversion (3uS) mode. Setting D13 puts the TLV5616 in power down (10nA) mode.

15 14 13 12 11 - 0

Din X SPD PWR X

Data for Conversion

Figure 4. TLV5616 Data Register

TLV5616 Timing

Figure 5. TLV5616 Timing Diagram

Note: The DAC’s chip select pin is held low in this application and therefore is not shown on the

timing diagram.

1 2 3 4 5 6 7 8 9 10 ... 13 14

Sin comentarios

Motorola MCU 68HC912 Manual de usuario Pagina 5