Philips ISP1301 manual Configurations and settings, Power requirements, I2C master selection

Philips Semiconductors ISP1301 USB OTG Transceiver Eval Kit User’s Guide

3. Configurations and settings

3.1.Power requirements

By default, the ISP1301 board is powered by a +5.0 V power supply through the DC jack (J12, inner +). The +5.0 V power can also be supplied from the USB Type-B connector (J4). However, when J4 is connected to a USB port on the PC, leave the USB mini-AB connector (J9) unconnected. If an external microprocessor is used to control the I2C controller chip PCF8584 (U4), the +5.0 V power can also be supplied from pin 16 and pin 18 of the microprocessor connector (J13).

When the +5.0 V power is correctly applied to the board, LED2 (green) will turn ON.

Table 3-1: +5.0 V power selection

Jumper	Descriptions
JP6	Short 1(UP5V) and 2 (+5V):		+5.0 V from the microprocessor interface (pin 16 or 18 of J13)
	Short 3	(H_VBUS) and 4 (+5V): +5.0 V from the VBUS line of the USB connector (pin 1 of J4)
	Short 5	(EXT5V) and 6 (+5V):	+5.0 V from the DC jack (J12, inner +) [default]

The power supply (VBAT pin) for the ISP1301 can be provided either from the onboard +3.3 V source or from the OTG Controller interface (pin 2 of J3).

Similarly, the power supply for the VIO (called VDD_LGC either from the onboard +3.3 V source or from the

in the ISP1301 datasheet) pin of the ISP1301 can be provided OTG Controller interface (pin 2 of J8).

	Table 3-2: VBAT and VIO selection
Jumper	Descriptions
JP2	Short: VBAT from the onboard +3.3 V source [default]
	Open: VBAT from the pin 2 of J3
JP5	Short: VIO from the onboard +3.3 V source [default]
	Open: VIO from the pin 2 of J8

3.2.I2C master selection

The I2C master controller can be supplied from any one of three sources:

•PC parallel port (software I2C master)

•Philips I2C controller chip PCF8584 (hardware I2C master)

•External I2C master that is connected to the I2C header J11.

Table 3-3: I2C master selection

Jumper	Descriptions
JP3	Short 1 (SDA_8584) and 2 (SDA5V): SDA from PCF8584
	Short 2 (SDA5V) and 3 (SDA_PC): SDA from PC parallel port [default]
	Open:	SDA from I2C connector (pin 4 of J11)
JP4	Short 1	(SCL_8584) and 2 (SCL5V): SCL from PCF8584
	Short 2	(SCL5V) and 3 (SCL_PC): SCL from PC parallel port [default]
	Open:	SCA from I2C connector (pin 3 of J11)

Note: SCL and SDA come from the same I2C master.

UM10028_1		© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
User’s Guide	Rev. 1.0—February 2003	6 of 18