SX8801IRXXMLTRT View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8801IRXXMLTRT' PDF : 135 Pages View PDF
XE8801A – SX8801R
Each bit can be set individually for pull-up or not using register RegPBPullup. Input is pulled up when its
corresponding bit in this register is set to 1. Default status after (resetpconf) is 0, which means without pull up. To
limit power consumption, pull-up resistors are only enabled when the associated pin is either a digital input or an N-
channel open-drain output with the pad set to 1. In the other cases (push-pull output or open-drain output driven
low), the pull up resistors are disabled independent of the value in RegPBPullup.
After power-on reset, the Port B is configured as an input port without pull-up.
The input buffer is always active, except in analog mode. This means that the Port B input should be a valid digital
value at all times unless the pin is set in analog mode. Violating this rule may lead to high power consumption.
12.7.2 Port B digital function specification
Sym
VINH
VINL
VOH
description
Input high voltage
Input low voltage
Output high voltage
VOL Output low voltage
RPU Pull-up resistance
Cin Input capacitance
min
typ
max unit Comments
0.7*VBAT
VBAT
V
VBAT≥2.4V
VSS
0.2*VBAT V
VBAT≥2.4V
VBAT-0.4
VSS
VBAT
V VBAT=1.2V, IOH =0.3mA
VBAT=2.4V, IOH =5.0mA
VBAT=4.5V, IOH =8.0mA
VSS+0.4 V VBAT=1.2V, IOL =0.3mA
VBAT=2.4V, IOL
=12.0mA
VBAT=4.5V, IOL
=15.0mA
20
50
80
kΩ
3.5
pF
Note 1
Note 1: this value is indicative only since it depends on the package.
© Semtech 2005
12-6
www.semtech.com
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