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TPIC84125-Q1 Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza TPIC84125-Q1
Descripción Electrónicos  LOW-FREQUENCY ANTENNA DRIVER FOR PASSIVE START AND PASSIVE ENTRY
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TPIC84125-Q1 Datasheet(HTML) 7 Page - Texas Instruments

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0
VS /2
VS
0
VS /2
VS
Out1
Out2
2 Bytes
Counter for start of
transmission with Gain 2:
16 bits
Counter for transmission
in Gain 2:
Transmitted
Data (Bits)
4 bits
Length of
destroy bits :
8 bits
Counter for start
of destroy bits
:
Start
8
16
32
56
( V )
TPIC84134-Q1
www.ti.com
SLDS176 – AUGUST 2010
Gains
Gain1 is a programmable gain for the output antenna working in normal mode to control the transmission power.
Gain2 allows the user to change the gain of the transmitted telegram for a programmable number of data bits
after which the telegram is continued in gain1. The time at which gain2 begins is programmable in the CSR;
alternatively, if the length of bits sent in gain2 is zero (0) the entire telegram is transmitted in gain1. Note, these
gains are not cascaded; it is either Gain1 or Gain2.
Gain for destroy bit transmission dictates the gain for the output channels set to "destroy bits". The gain for
destroy bits is a logarithmic scale and it is set to 500 mVpp by default.
Figure 3 shows an example in which Out1 is configured to transmit the telegram, using both Gain1 and Gain2.
The counter for start of transmission with Gain2 = 2 Bytes, and the counter for transmission in gain2 = 16 bits.
Note that the transmission resumes at Gain1 after the transmission at Gain2. The diagram also displays Out2
with destroy bits where counter for start of destroy bits = 8 bits, and Length of destroy = 4 bits.
Figure 3. Transmitted Telegram Sample Gain1 And Gain2
Multiplexer (Mux)
A multiplexer is used to pick between the various gains of the signal to each output, as well as selecting the
phase ( 0° or 180°) of the transmitting antennas.
A maximum of two outputs, or 2 half-bridges, can be activated at the same time in normal mode, where each is
designed to drive the required power into the antenna. Further, all other outputs can also be activated with
destroy bits at the same time(at a lower Vpp). As the bridges operate in a linear mode, the sine wave generation
at the bridge output is optimized to reduce EMI emissions and power dissipation.
Copyright © 2010, Texas Instruments Incorporated
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