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TPIC84000TPWPRQ1 Fiches technique(PDF) 9 Page - Texas Instruments |
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TPIC84000TPWPRQ1 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 29 page TPIC84125-Q1 www.ti.com SLDS175 – AUGUST 2010 Operation Modes There are two operating modes: SLEEP mode and WAKE-UP mode. In WAKE-UP mode, the device is either ready for the next transmission, or it is transmitting data. The wake-up command and the output configuration command are separated to avoid noise on the VS/2 signal at wake up. Note that the start command must happen at least 128 clock cycles after the wake-up command. The device transitions from the WAKE-UP mode to the SLEEP mode when the following conditions occur: • The Sleep bit in Configuration Register is set to 1 via SPI or • An over temperature fault condition is detected or • VS or VD under voltage is detected In SLEEP mode, the sine wave generation block is off, the outputs are in tri-state, the SPI is functioning, but the flags are not updated. The device goes from SLEEP mode to WAKE-UP mode when the following conditions occur: • The Sleep bit is set to 0 via the SPI or • The Sleep bit is set to 0 via the SPI and the CSR is read in case of an over temperature detection or VS under voltage NOTE When operating in the tri-state mode, there is a pull down of typically 150 k Ω at the Outx pins. Diagnosis As a function of protecting the TPIC84125 various diagnostic features such as over temperature warning, over temperature pre-warning and energy limiting protection have been implemented. Flags within a register are used to highlight a particular fault, or diagnosis, to the main controller, where each fault is essentially latched within the register until it is read by SPI interface. After having been read by the SPI, the register is then cleared. This protection scheme is implemented within the TPIC84125 itself, as follows: Over Temperature When over-temperature occurs while the device is operating in WAKE-UP mode; where upon over temperature the device goes to SLEEP mode and the "over temperature" and "failure" flags are set to 1 in the CSR. If the device is in SLEEP mode, it stays in this mode but no SPI flag is updated. Temperature Pre-Warning Temperature pre-warning has no impact on the operating mode of the device. If the device is in WAKE-UP mode, the "temperature pre-warning" flag is set to 1 in the CSR; if the device is in SLEEP mode, no SPI flag is updated. Under Voltage • VS under voltage: Occurs when VS goes below the VS under voltage threshold – If the device is in WAKE-UP mode, it goes to SLEEP mode and the "under voltage at VS" and "failure" flags are set to 1 in the CSR. – If the device is in SLEEP mode, it stays in this mode but no SPI flag is updated. • VD under voltage: Occurs when VD goes below the VD under voltage – If the device is in WAKE-UP mode, it goes to SLEEP mode and the "under voltage at VD" and "failure" flags are set to 1 in the CSR. – If the device is in SLEEP mode, it stays in this mode but no SPI flag is updated. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): TPIC84125-Q1 |
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