Redpine Signals Inc. Proprietary and Confidential
Page 22
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Appendix
9.1
SDIO connectivity for Windows OS
While using the Redpine SDIO module on an embedded windows platform, the following precautions have to be followed
1.
SDIO device would be recognized and drivers would be loaded by embedded windows operating system using signal
activity on SD0_CD# and SD0_WP. SD0_CD signal has to be connected to ground through a zero ohm resistor.
SD0_WP signal has to be connected to ground through a 10K resistor.
2.
Drive 3.3V voltage to Redpine module from the output of a power gate or regulator which is controlled with
SD0_PWR# as shown in the below circuit. SDIO stack on windows operating system controls the SD0 PWR# signal
and is the output of application processor. As shown below, 3.3V Main is uncontrolled 3.3V signal and regulator
3.3VS is fed to Redpine Wi-Fi module.
3.
If reset to Redpine module is from RC circuitry, 3.3V input to RC circuit should be from voltage regulator output. If
reset is controlled from microprocessor GPIO pin, then the reset has to be asserted for a minimum of 10ms after the
SD0_PWR# signal.
