UPD31172 Datasheet, PDF (1/44 Pages) NEC – VRC4172TM COMPANION CHIP FOR VR4121TM

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD31172
VRC4172^TM
COMPANION CHIP FOR VR4121^TM
DESCRIPTION
The µPD31172 (commercial name: VRC4172) is a companion chip designed for NEC’s µPD30121 microprocessor
(commercial name: VR4121).
The VRC4172 has the following functions available on chip: a USB host controller, an IEEE1284 parallel controller,
a 16550 serial controller, a PS/2 controller, general-purpose ports (GPIO), programmable chip select (PCS), and a
PWM controller (a duty modulated light pulse generation function for LCD backlighting).
The VRC4172 can be directly connected to the VR4121, allowing a reduction in the man-hours required for
development of a Windows™ CE system.
Detailed function descriptions are provided in the following user’s manual. Be sure to read it before
designing.
• VRC4172 User’s Manual (U14386E)
FEATURES
• Directly connectable to VR4121
• On-chip USB host controller
• USB ports: 2
• Compliant with the USB OpenHCI specifications, release 1.0
• Communicates with USB device asynchronously with host CPU
• Full-speed (12 Mbps) and low-speed (1.5 Mbps) modes supported
• System clock: 48 MHz
• On-chip PS/2 controller
• On-chip IEEE1284 parallel controller
• On-chip 16550 serial controller
• General-purpose ports (GPIO): 24
• On-chip PWM controller
• Duty modulated light pulse generation function for LCD backlighting
• Internal maximum operating frequency: 48 MHz
• Power supply voltage: VDD = 3.3 V ± 0.3 V
• Package: 208-pin plastic FBGA
APPLICATIONS
• Battery-driven portable information devices
• Peripheral devices for PCs, etc.
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. U14388EJ2V0DS00 (2nd edition)
Date Published May 2000 N CP(K)
Printed in Japan
The mark shows major revised points.