
Chapter 2: Hardware Interface Description
May 31, 2008
Module Hardware Description
23
USB Device Interface
W24 incorporates a standard Universal Serial Bus (USB) interface.
The interface consists of the following pins (see
Table 2-5
):
The W24 USB electrical interface and protocol conform to the USB 2.0 full-speed specifications.
W24 is defined as a USB device on the 70-pin Host Connector. This interface does not support
hub or host functionality.
USB may be used for standard communications with W24, as done through the UART interface.
USB Host Interface (Stacked configuration only)
W24 incorporates USB Host interface intended to support G24 USB interface, in stacked
configuration. The interface consists of the following pins (see
Table 2-6
):
The W24 USB Host electrical interface and protocol conform to the USB 2.0 full-speed
specifications.
USB may be only used for standard communications between W24 and G24 (stacked
configuration only), as done through the UART interface. Setting USB Host communication is
enabled by the AT+iHIF=5 command.
Important:
W24 relies on the host to provide the USB_VBUS voltage, for both USB device and
USB host interfaces. Therefore, if only USB host interface is to be used, or if host
interface is going to be used when the device USB interface is inactive, make sure
to provide the valid USB_VBUS voltage on the Host Connector.
Table 2-5: USB Device Interface Signals (at Host connector)
Pin #
Pin Name
Description
10
USB_VBUS
USB bus power
12
USB_DP
USB bus serial data
14
USB_DN
USB bus serial data
Table 2-6: USB Host Interface Signals (at G24 connector)
Pin #
Pin Name
Description
10
USB_VBUS
USB bus power
12
USB_DP
USB bus serial data
14
USB_DN
USB bus serial data
Summary of Contents for W24
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Page 28: ...Regulatory Approvals 6 Module Hardware Description May 31 2008 ...
Page 56: ...Antenna Interface 34 Module Hardware Description May 31 2008 ...
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