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TPIC84000TPWPRQ1 Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce TPIC84000TPWPRQ1
Description  LOW-FREQUENCY ANTENNA DRIVER FOR PASSIVE START AND PASSIVE ENTRY
Download  29 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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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
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Product Folder Link(s): TPIC84125-Q1


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