 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
34708 Datasheet(PDF) 102 Page - Freescale Semiconductor, Inc |
|
|
|||||||||||||||||||||||||||||
34708 Datasheet(HTML) 102 Page - Freescale Semiconductor, Inc |
|
|
102 / 159 page  Analog Integrated Circuit Device Data Freescale Semiconductor 102 MC34708 Functional Block Description Figure 30. UART Operation 7.8.4.12 USB Host (PC or HUB) Operation Mode When the attached accessory is a USB host or hub, the ID pin floats. During normal operation, when setting the control bits, both the D PLUS to DP and the D MINUS to DM switches are switched on (see Figure 31). The mini USB interface sets the charger input current limit and sets the bit USB in the USB Device type register. When SW_HOLD = 0, the switching action of D+ to DP and the D- to DM switches, are controlled by the WAIT bit. If WAIT = 1, the signal switches will be turned on after a WAIT time. If WAIT = 0, the signal switches won't be turned on until the WAIT bit is set to '1' by the SPI. When SW_HOLD = 1, regardless of what the WAIT is set to, '0' or '1', the signal switches are turned on once the USB host is identified. After the DPLUS to DP and the DMINUS to DM switches are turned on, the baseband can pull the DPLUS signal high to start the USB attaching sequence. The detachment is detected by the falling edge of the USBDETS signal. When the USBDETS falls, the Detach bit is set to inform the baseband. The MC34708 USB detection then enters the Standby mode. Figure 31. USB Operation 7.8.4.13 USB charger or Dedicated Charger Operation Mode When the attached accessory is a USB Charger or Dedicated Charger, the MC34708 enables the bit USB Charge or the Dedicated CHG in the USB Device type register. During normal operation when setting of the control bits, the D PLUS and D MINUS switches are turned on for the USB Charger, but not for the Dedicated Charger. The VBUS detector is used to monitor the detachment of the charger. The falling edge of USBDETS is an indication of charger detachment. Unplugging the mini-USB connector and unplugging the AC side, both lead to the same detachment conclusion. The Detach bit is set to inform the host. The MC34708 USB detection then enters the Standby mode. VBUS ID D+ D- GND Baseband SHLD UART Cable RxD TxD DP DM ID GND UART Interface ADC ID Det VBUS Det UART VBUS ` VBUS ID D+ D- GND Baseband SHLD USB Cable DPLUS DMINUS DP DM ID GND USB Host ADC ID Det VBUS Det 5V USB Xcvr VBUS |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
