M38K29T-ADF Renesas Electronics America, M38K29T-ADF Datasheet - Page 12

• Manufacturer Part Number: M38K29T-ADF
• Description: DEV TEMPORARY TARGET BOARD FOR M
• Manufacturer: Renesas Electronics America

Specifications of M38K29T-ADF

• Accessory Type: Target Board
• For Use With/related Products: M38K09RFS, M38K29RFS
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7. USB Port Circuit
The M38K29T-ADF has some patterns for simplified evaluation of USB-related functions.
Figure 7.1 shows a USB port circuit diagram. This diagram is a summarized version for reference
purposes. Therefore, to design your circuit, see USB specifications or reference materials about 38K0
and 38K2 Group circuits.
When the M38K29T-ADF is shipped from the factory, USB-related parts are not mounted. Mount
them as necessary. And, though the USB connectors are included with this product, resistors are not
included. Get them separately.
(1) USB Reference Power Supply (USBVREF)
(2) USB Reference Voltage Output (TrON)
(3) USB Upstream I/O (D0+/D0-)
(4) USB Downstream I/O (D1-/D1+ and D2-/D2+)
If you make an MCU operate at 4.0 ≤ Vcc ≤ 5.25 V, use the internal USB reference power supply
source of the MCU. To use it, set switch SW2 to the NC side.
If you make an MCU operate at 3.0 ≤ Vcc < 4.0 V, you cannot use the internal USB reference
power supply source of the MCU. Set switch SW2 to the TP5 side and apply a voltage between
3.0 and 3.6 V to TP5.
This is the pullup voltage output pin for the USB up-port. The M38K29T-ADF has the pattern
for mounting a resistor for pulling up the D0+ pin. Use a 1.5kΩ resistor at R4.
Pins D+/D- represent the USB upstream signal pair D+ and D-. These signals have the patterns
for mounting a USB connector and resistors for impedance-matching. To do so, use resistors for
impedance matching at R5 and R6, and mount connector UBB-4R-D10T-1 included with this
product (made by JST) for USB upstream at J5.
Pins D+/D- represent the USB downstream signal pair D+ and D-. For these signals, the
M38K29T-ADF has the patterns for mounting resistors for impedance-matching and pulldown
resistors. To do so, use resistors for impedance matching at R7, R8, R11 and R12, use pulldown
resistors at R9, R10, R13 and R14, and mount the UBA-4R-D10T-1 connectors included with this
product (made by JST) for USB downstream at J3 and J4.
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