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AN39: USB Interface Description

4.2 Composite Device Enumeration for “Mdm“ Variant

HC15_USB_Interface_v02 Page 24 of 28 2007-04-05

Confidential / Preliminary

4.2.2 Configuration Descriptor

4.2.2.1 Configuration

4.2.2.2 Interface 0 (MODEM Port: CDC ACM Control)

Table 28: MDM\Configuration Descriptor\Configuration

Name Value Dec Hex

bLength Valid 9 0x09

bDescriptorType CONFIGURATION 2 0x02

wTotalLength 113 bytes 113 0x0071

bNumInterface 4 4 0x04

bConfigurationValue 1 1 0x01

iConfiguration 0 0 0x00

bmAttributes.SelfPowered Dependent on configuration

(see [1]; AT^SUSB)

If the firmware download fails - e.g., due to a power supply disconnect during download - the module’s

boot loader enumerates as bus powered (with bMaxPower=0xFA (500mA), irrespective of the current

descriptor setting.

bmAttributes.RemoteWakeup Supported

bMaxPower Dependent on configuration

(see [1]; AT^SUSB)

0..255 0x00..0xFA

Table 29: MDM\Configuration Descriptor\Interface0

Name Value Dec Hex

bLength Valid 9 0x09

bDescriptorType INTERFACE 4 0x04

bInterfaceNumber 0 0 0x00

bAlternateSetting 0 0 0x00

bNumEndpoints 1 1 0x01

bInterfaceClass Communication Control 2 0x02

bInterfaceSubClass Abstract Line Control Model 2 0x02

bInterfaceProtocol Common AT commands 1 0x01

iInterface 3 3 0x03

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