AD3552R datasheet(37/59 Pages) AD

37 / 59 page

Data Sheet

AD3541R

THEORY OF OPERATION

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Rev. A | 37 of 59

The ALERT pin requires a pull-up resistor that can be provided

externally or internally. The chip incorporates an internal 2.5 kΩ

pull-up resistor that can be enabled by setting the ALERT_ENA-

BLE_PULLUP bit in the INTERFACE_CONFIG_D register.

The ALERT pin is deasserted when all the errors are cleared in

their corresponding registers.

DEVICE ID

The AD3541R includes numerous registers providing silicon related

information. The following registers can be used to identify that the

correct chip type and version are assembled:

►

CHIP_TYPE

►

PRODUCT_ID_L

►

PRODUCT_ID_H

►

CHIP_GRADE

►

SPI_REVISION

►

VENDOR_L

►

VENDOR_H

SUMMARY OF INTERFACE ACCESS MODES

Finding the correct SPI mode can be difficult given the number of

modes and the restrictions on specific registers or memory regions.

To facilitate the implementation of the driver in the CPU, a decision

tree is presented in Figure 95. Figure 95 depicts how the driver

must proceed depending on the configuration of the interface and

the registers being accessed.

Figure 95. Register Access Modes

AD3552R Datasheet(PDF) 37 Page - Analog Devices