Datasheet
V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)
R01UH0042EJ0500 Rev.5.00 Page 1047 of 1513
Aug 12, 2011
21.3.2 Connection configuration
Figure 21-3. Example of USB Function Controller Connection
VBUS
D+
D−
P42/INTP10
UDPF
UDMF
V850ES/JG3-H,
V850ES/JH3-H
P41
UV
DD
IC1
UV
DD
R2
IC2
R1
VBUS is resistance-
divided at a ratio of R1:R2.
Insert a series resistor adjacent to
the V850ES/JG3-H or V850ES/JH3-H.
Make the length of the wiring between
resistors and D+/D− of the USB connector
the same.
USB connector
Schmitt buffer
recommended
50 kΩ or more
(floating protection)
Connect a pull-up
resistor to D+.
1.5 kΩ ±5%.
Determine the pull-up resistor value in accordance
with the buffer type (pull-down/pull-up) of the port
pin to be used.
30 Ω ±5%
30 Ω ±5%
(1) Series resistor connection to D+/D−
Connect series resistors of 30 Ω ±5% to the D+/D− pins (UFDP, UFDM) of the USB function controller in the
V850ES/JG3-H and V850ES/JH3-H. If they are not connected, the impedance rating cannot be satisfied and the
output waveform may be disturbed.
Allocate the series resistors adjacent to the V850ES/JG3-H or V850ES/JH3-H, and make the length of the wiring
between the series resistors and the USB connectors the same, to make the impedance of D+ and D− equal (a
differential with 90 Ω ±5% is recommended).
(2) Pull-up control of D+
Because the function controller of the V850ES/JG3-H and V850ES/JH3-H is fixed to full speed (FS), be sure to pull
up the D+ pin (UFDP) by 1.5 kΩ ±5% to UV
DD.
To disable a connection report (D+ pull up) to the USB host/HUB (such as during high priority servicing or
initialization), control the pull-up resistor of D+ via a general-purpose port in the system. For a circuit such as the
one shown in Figure 21-3, control the pull-up control signal and the VBUS input signal of the D+ pin by using a
general-purpose port and the USB cable VBUS (AND circuit). In Figure 21-3, if the general-purpose port is low
level, pulling up of D+ is prohibited.
For the IC2 in Figure 21-3, use an IC to which voltage can be applied when the system power is off.