CS5378 datasheet(19/88 Pages) CIRRUS

19 / 88 page

CS5378

DS639F2

3.4 Synchronization

Digital filter phase and analog sample timing of the

∆Σ modulator connected to the CS5378 are syn-

chronized by a rising edge on the SYNC pin. If a

synchronization signal is received identically by all

CS5378 devices in a measurement network, syn-

chronous sampling across the network is guaran-

teed.

3.5 System Configuration

Through the serial configuration interface, filter

coefficients and digital filter register settings can

either be programmed by a microcontroller or auto-

matically loaded from an external EEPROM after

reset. System configuration is only required for the

CS5378 device, as other devices are configured via

the CS5378 General Purpose I/O pins.

Two registers in the digital filter, SYSTEM1 and

SYSTEM2 (0x2C, 0x2D), are provided for user de-

fined system information. These are general pur-

pose registers that will hold any 24-bit data values

written to them.

3.6 Digital Filter Operation

After analog to digital conversion occurs in the

modulator, the oversampled 1-bit

∆Σ data is read

into the CS5378 through the MDATA pin. The dig-

ital filter then processes data through the enabled

filter stages, decimating it to 24-bit words at a pro-

grammed output word rate. The final 24-bit sam-

ples are concatenated with 8-bit status words and

placed into an output FIFO.

3.7 Data Collection

Data is collected from the CS5378 through the se-

rial data interface. When data is available, serial

transactions are automatically initiated to transfer

24-bit data or 32-bit status+data from the output

FIFO to the system telemetry. The output FIFO has

eight data locations to permit latency in data collec-

tion.

3.8 Integrated peripherals

Test Bit Stream (TBS)

A digital signal generator built into the CS5378

produces a 1-bit

∆Σ sine wave. This digital test bit

stream is connected to the CS5373A test DAC to

create high quality analog test signals or internally

looped back to the CS5378 MDATA input to test

the digital filter and data collection circuitry.

Time Break

Timing information is recorded during data collec-

tion by strobing the TIMEB pin. A dedicated flag

in the sample status bits, TB, is set high to indicate

during which measurement the timing event oc-

curred.

General Purpose I/O (GPIO)

Eight general purpose pins are available on the

CS5378 for system control. Each pin can be set as

input or output, high or low, with an internal pull-

up enabled or disabled. The CS3301A/02A and

CS5373A devices in Figure 9 are configured by

simple pin settings controlled through the CS5378

GPIO pins.

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