AD5753 datasheet(60/75 Pages) AD

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ADFS5758

Data Sheet

Rev. 0 | Page 60 of 75

Key Register

Address: 0x08, Reset: 0x080000, Name: Key

This register accepts specific key codes to perform tasks such as calibration memory refresh and software reset. Bits[15:0] of this register

always read back as 0x0000. All unlisted key codes are reserved.

Table 36. Bit Descriptions for Key

Bits

Bit Name

Description

Reset

Access

FAULT_PIN_STATUS

The FAULT_PIN_STATUS bit reflects the inverted current status of the FAULT pin.

0x0

[20:16]

REGISTER_ADDRESS

0x0

[15:0]

KEY_CODE

Key code.

0x0

R0/W

0x4765: lock user configuration register space. This key initiates an automatic

calculation of the ideal CRC that all subsequent background CRC calculations are

compared to.

0x896D: first of two keys to unlock the user configuration register space.

0x57AB: second of two keys to unlock the user configuration register space.

0x15FA: first of two keys to initiate a software reset.

0xAF51: second of two keys to initiate a software reset.

0x1ADC: key to initiate a single ADC conversion on the selected ADC channel.

0x0D06: first of two keys to reset the watchdog timer.

0xF00D: second of two keys to reset the watchdog timer.

0x5CEA: key to force a recalculation of the background CRC.

0xFCBA: key to initiate a calibration memory refresh to the shadow registers. Note that

this key is only valid the first time it is run and has no effect if subsequent writes occur

within a given system reset cycle.

General-Purpose Configuration 1 Register

Address: 0x09, Reset: 0x090204, Name: GP_CONFIG1

This register is used to configure functions such as the temperature comparator threshold and CLKOUT, as well as enabling other

miscellaneous features.

Table 37. Bit Descriptions for GP_CONFIG1

Bits

Bit Name

Description

Reset

Access

FAULT_PIN_STATUS

The FAULT_PIN_STATUS bit reflects the inverted current status of the FAULT pin.

0x0

[20:16]

REGISTER_ADDRESS

0x0

[15:14]

Reserved

Reserved. Do not alter the default value of this bit.

0x0

[13:12]

SET_TEMP_THRESHOLD

Set the temperature comparator threshold value.

0x0

R/W

00: 142°C (default).

01: 127°C.

10: 112°C.

11: 97°C.

[11:10]

CLKOUT_CONFIG

Configure the CLKOUT pin.

0x0

R/W

00: disable; no clock is output on the CLKOUT pin (default).

01: enable; clock is output on CLKOUT pin according to the CLKOUT_FREQ bits

(Bits[9:7]).

10: reserved (do not select this option).

11: reserved (do not select this option).

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