Datasheet

12
LDC1612 , LDC1614
SNOSCY9A –DECEMBER 2014–REVISED MARCH 2018 www.ti.com
Product Folder Links: LDC1612 LDC1614
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Feature Description (continued)
7.3.6 Device Status Monitoring
The LDC1612/LDC1614 can monitor attached sensors and can report on device status and sensor status via the
I2C interface. Reported conditions include:
• Sensor Amplitude outside of optimum range
• Sensor unable to oscillate
• New conversion data available
• Conversion errors
Use of this monitoring functionality can alert the system MCU of unexpected conditions such as sensor damage.
Refer to Device Status Registers for more information.
7.4 Device Functional Modes
7.4.1 Startup Mode
When the LDC powers up, it enters into Sleep Mode and will wait for configuration. Once the device is
configured, exit Sleep Mode and begin conversions by setting CONFIG.SLEEP_MODE_EN to b0.
It is recommended to configure the LDC while in Sleep Mode. If a setting on the LDC needs to be changed,
return the device to Sleep Mode, change the appropriate register, and then exit Sleep Mode.
7.4.2 Sleep Mode (Configuration Mode)
Sleep Mode is entered by setting the CONFIG.SLEEP_MODE_EN register field to 1. While in this mode, the
device configuration is retained, but the device does not perform conversions. To enter Normal mode to perform
conversions, set the CONFIG.SLEEP_MODE_EN register field to 0. After setting CONFIG.SLEEP_MODE_EN to
b0, sensor activation for the first conversion will begin after 16,384÷ƒ
INT
elapses. Refer to Clocking Architecture
for more information on the device timing.
While in Sleep Mode the I2C interface is functional so that register reads and writes can be performed. Entering
Sleep Mode will clear all conversion results, any error conditions, and de-assert the INTB pin.
For applications which do not require continuous conversions, returning the device to Sleep mode after
completion and readback of the desired number of conversions can provide power consumption savings. Refer
to the TI Applications Note Power Reduction Techniques for the LDC131x/161x for Inductive Sensing for more
information.
7.4.3 Normal (Conversion) Mode
When operating in the normal (conversion) mode, the LDC is repeatedly sampling the frequency of the sensor(s)
and generating sample outputs for the active channel(s) based on the device configuration.
7.4.4 Shutdown Mode
When the SD pin is set to high, the LDC will enter Shutdown Mode. Shutdown Mode is the lowest power state.
To exit Shutdown Mode and enter Sleep Mode, set the SD pin to low. Entering Shutdown Mode will return all
registers to their default state.
While in Shutdown Mode, no conversions are performed. In addition, entering Shutdown Mode will clear any
error condition and de-assert the INTB pin (when de-asserted, INTB will be actively driven high). While the
device is in Shutdown Mode, is not possible to read to or write from the device via the I2C interface.
It is permitted to change the ADDR pin setting while in Shutdown Mode.
7.4.4.1 Reset
The device can be reset by writing to RESET_DEV.RESET_DEV. Any active conversion will stop and all
registers will return to their default values. This register bit will always return 0b when read.