User Instructions

Stollmann
E + V GmbH
BlueRS+I
DesignGuide
Author: cl Date of Savin
g
: 19.03.04 Ref: Revision: 1.2 Pa
g
e 12 of 22
The signal levels are dependent on the supply voltage. The inputs are in any case
5V tolerant. The outputs are supplied as open-drain over 10 kOhm (RxD, CTS) or
100 kOhm (others) by the supply voltage such that the output level is raised to the
supply level. This should be the same on the motherboard to achieve compatibility.
Current sinks should be low-active. 10mA can be driven. It is not possible to drive
LEDs high active directly. Drive LEDs low active or via driver circuitry.
Vcc= 5 V Vcc = 3,3 V
V
IH
2,5..5,5 V 2,5..5,5 V
V
IL
0..0,8 V 0..0,8 V
V
OH
(RxD,CTS)
5 V via 10 kOhm 3,3 V via 10 kOhm
V
OH
(all other Outputs)
5 V via 100 kOhm
Imax: -10µA
3,3 V via 100 kOhm
Imax -10µA
V
OL
0,55 V @ 10 mA
Imax: +24mA
0,55 V @ 10 mA
Imax: +24mA
5.2.2 Connector P1
This Connector includes the serial Interface (TTL) and power supply.
Output/Input definition of table below
BlueRS+ Device
Output
Input
Output Circuit
Open Drain
74LVC07
10/100 kOhm
Vcc= 5V or 3,3V
Voh> 0,9 VCC
@ Ioh < - 3 µA
3,3V
Output Circuit