ADS6445 datasheet(15/75 Pages) STMICROELECTRONICS

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DEVICE PROGRAMMING MODES

USING PARALLEL INTERFACE CONTROL ONLY

USING SERIAL INTERFACE PROGRAMMING ONLY

USING BOTH THE SERIAL INTERFACE AND PARALLEL CONTROLS

ADS6445, ADS6444

ADS6443, ADS6442

SLAS531 – MAY 2007

ADS644X offers flexibility with several programmable features that are easily configured.

The device can be configured independently using either parallel interface control or serial interface

programming.

In addition, the device supports a third configuration mode, where both the parallel interface and the serial

control registers are used. In this mode, the priority between the parallel and serial interfaces is determined by a

priority table (refer to Table 4). If this additional level of flexibility is not required, the user can select either the

serial interface programming or the parallel interface control.

To control the device using parallel interface, keep RESET tied to high (LVDD). Pins CFG1, CFG2, CFG3,

CFG4, PDN, SEN, SCLK, and SDATA are used to directly control certain functions of the ADC. After power-up,

the device will automatically get configured as per the parallel pin voltage settings (refer to Table 5 to Table 8)

and no reset is required. In this mode, SEN, SCLK, and SDATA function as parallel interface control pins.

Frequently used functions are controlled in this mode—output data interface and format, power down modes,

coarse gain and internal/external reference. The parallel pins can be configured using a simple resistor string as

illustrated in Figure 3.

Table 3 has a description of the modes controlled by the parallel pins.

Table 3. Parallel Pin Definition

CONTROL FUNCTIONS

SEN

Coarse gain and internal/external reference.

SCLK, SDATA

Sync, deskew patterns and global power down.

PDN

Dedicated pin for global power down

CFG1

1-Wire/2-wire and DDR/SDR bit clock

CFG2

14x/16x Serialization and SDR bit clock capture edge

CFG3

Reserved function. Tie CFG3 to Ground.

CFG4

MSB/LSB First and data format.

In this mode, SEN, SDATA, and SCLK function as serial interface pins and are used to access the internal

registers of ADC. The registers must first be reset to their default values either by applying a pulse on RESET

pin or by a high setting on the <RST> bit (in register ). After reset, the RESET pin must be kept low.

The serial interface section describes the register programming and register reset in more detail.

Since the parallel pins (CFG1-4 and PDN) are not used in this mode, they must be tied to ground. The register

override bit <OVRD> - D10 in register 0x0D has to be set high to disable the control of parallel interface pins in

this serial interface control ONLY mode.

For increased flexibility, a combination of serial interface registers and parallel pin controls (CFG1-4 and PDN)

can also be used to configure the device.

The parallel interface control pins CFG1 to CFG4 and PDN are available. After power-up, the device will

automatically get configured as per the parallel pin voltage settings (refer to Table 5 to Table 11) and no reset is

required. A simple resistor string can be used as illustrated in Figure 3.

SEN, SDATA, and SCLK function as serial interface pins and are used to access the internal registers of ADC.

The registers must first be reset to their default values either by applying a pulse on RESET pin or by a high

setting on the <RST> bit (in register ). After reset, the RESET pin must be kept low.

The Serial Interface section describes the register programming and register reset in more detail.

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