HID Hi-O iCLASS Installation Guide - Manual (Page 21)

iCLASS OEM75 Integration Guide, 3141-907, Rev. B.0
January 2014 Page 21 of 49
HID GLOBAL CONFIDENTIAL AND/OR PROPRIETARY INFORMATION. This document contains confidential and/or proprietary
information, which may not be duplicated, published, disseminated or disclosed, or used for any purpose, without the written
consent of HID Global Corporation. If you are an unintended recipient of this information or are unwilling to accept the above
restrictions, please immediately return this document to HID Global Corporation, 15370 Barranca Pkwy, Irvine, CA 92618-3106.
Table 5-6: P1 I/O Electrical Specifications
Pin Name Parameters Notes
Voltage Current
+3.3 VDC 3.3V +/- 5%
sourced
+20mADC This pin taps off an internal 3.3 VDC linear
regulator. The internal regulator has current
and thermal overload protection.
Ground 0.0VDC N/A Return for +3.3VDC
SPI / I2C Clock 0V to 5.0V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port D6 of the
main microcontroller. For I2C operation an
external 10k Pull-up resistor is required. TTL
0-5.0 VDC Input (O.C.Output).
/SPI_CS 0V to 5.0V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port D0 and
D7 of the main microcontroller TTL 0-5.0
VDC Input (O.C.Output).
SPI Data In
I2C SDA
0V to 5.0V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port D5 of the
main microcontroller. For I2C operation
OEM75 already contains an internal pull-up
resistor. TTL 0-5.0 VDC Input (O.C.Output).
/SPI Data Out 0V to 3.3V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port D4 of the
main microcontroller. TTL 0-3.3VDC Output
UART RX 0V to 5.0V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port C7 of the
main microcontroller. TTL 0-5.0VDC Output
UART TX 0V to 3.3V
(+/– 0.3V)
+/-5mADC * This pin connects directly to Port C6 of the
main microcontroller. TTL 0-3.3VDC Output