Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)

R01UH0042EJ0500 Rev.5.00 Page 1046 of 1513

Aug 12, 2011

21.3 External Circuit Configuration

21.3.1 Outline

In USB transmission, when communication is performed with the host controller and function controller facing each

other, pull-up/pull-down resistors must be connected to the USB signal (D+/D−) to identify the communication partner.

Moreover in the V850ES/JG3-H and V850ES/JH3-H, series resistors must also be connected.

Because the V850ES/JG3-H and V850ES/JH3-H do not include these pull-up/pull-down resistors and series resistors,

be sure to connect them externally.

The following shows the outline configuration of the USB transmission line. For details of the external configuration, see

the description provided in each section.

Figure 21-2. Outline Configuration of Pull-up, Pull-down, Series Resistors in USB Transmission Line

Function

device

Host device

(USB function controller in the V850ES/JG3-H and

V850ES/JH3-H is fixed to full speed)

Connect series resistors when using the V850ES/JG3-H

and V850ES/JH3-H

Full speedLow speed

15 kΩ ±5%15 kΩ ±5%

Function side

Mount either one in accordance with operation speed.

Host side

VDD

D+

D-