Harman Kardon AVR 171/230, Service Manual

Page: 92 / 174

Data Sheet: DM Series
DM860A Networked Media Processor
dat_DM860A_1_1_datasheet.doc CONFIDENTIAL Version 1.1 – July 11
th
2011 - Page 20 of 70
2.13 USB 2.0 OTG
Name Pin Type Description
USBD+ B1 I/O Positive data line that is connected to the serial USB cable
USBD– A1 I/O Negative data line that is connected to the serial USB cable
USBID E2 I USB ID pin of mini-AB receptacle
USBREXT C2 I External bias resistor (2K7, 1%); connect resistor to VSSUSB
USBVBUS D2 I VBUS voltage sense
USBVBUSDRV E3 O Control signal to control VBUS 5V voltage source
USBXTALI C4 I Oscillator circuit input for a 24.000 MHz crystal (optional).
Without external crystal, pull this pin to GND.
USBXTALO C3 O Oscillator circuit output for a 24.000 MHz crystal (optional).
Without external crystal, leave this pin open.
USBATST D3 – Do not connect
2.14 Power-on Reset Pins
Name Pin Type Description
NRES12REF D6 I Voltage reference input. NRES12OUT is release when this input
voltage exceeds V
TH12
.
NRES12OUT C5 O Open-drain reset (active low) for 1.2V core power supply.
NRES33REF D5 I Voltage reference input. NRES33OUT is release when this input
voltage exceeds V
TH33
.
NRES33OUT D4 O Open-drain reset (active low) for 3.3V core power supply
2.15 Real-Time Clock (RTC) Pins
Name Pin Type Description
RTCXIN F2 I Oscillator circuit input. Connect 32.768 kHz tuning fork crystal here.
RTCXOUT G2 O Oscillator circuit output. Connect 32.768 kHz tuning fork crystal here.
VDD33RTC F1 Power Power supply (+3.3 V) for RTC
VSS33RTC E1 Power Ground (0 V) for RTC
Harman Kardon AVR 171 Service Manual
Page 92 of 174