Texas Instruments PCM1681, Руководство пользователя

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SBAU137 – April 2008
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Electrostatic Discharge Warning
1.4.3 DEM-PCM1681 Daughtercard Configuration Controls
This section discusses the headers that are provided as configuration controls for the PCM1681
daughtercard.
1.4.3.1 HDR001: Select Signal Path for Pin 1 of PCM1681
Either 1-2 or 3-2 must be shorted according to the function of pin 1 of the PCM1681, which is determined
by the HDR002 setting. Table 1-4 summarizes the select signal path configuration for HDR002.
Table 1-4. HDR001: Signal Path Selection for Pin 1 of PCM1681
HDR001
Signal Path for Pin 1 of PCM1681 1-2 3-2
Short Open Path for ZR1 output for S/W (SPI and I
2
C) Control Mode
Open Short Path for FMT0 input for H/W Control Mode
1.4.3.2 HDR002: Select Mode Control of PCM1681
Either 1-2, 3-4, 5-6, or 7-8 must be shorted in order to select mode control type and oversampling
condition of the PCM1681. Table 1-5 summarizes the mode control selection configuration for HDR002.
Table 1-5. HDR002: Mode Control Selection of PCM1681
HDR002
Mode Control of PCM1681
1-2 3-4 5-6 7-8
Short Open Open Open S/W (I
2
C) Control Mode
Open Short Open Open H/W Control Mode with Narrow Band Operation
Open Open Short Open H/W Control Mode with Wide Band Operation
Open Open Open Short S/W (SPI) Control Mode
1.5 Electrostatic Discharge Warning
Many of the components on the DEM-DAI1681 are susceptible to damage by electrostatic discharge
(ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling
the EVM, including the use of a grounded wrist strap at an approved ESD workstation.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.