
Thundercomm
TurboX D845 System on Module
Copyright © 2018 All Rights Reserved , Thundercomm Technology Co., Ltd.
39
Parameter
Description
Min
Max
Units
VIH
High-level input voltage,
CMOS/Schmitt,
0.7 x VDDPX_3
0.3
V
VIL
Low-level input voltage,
CMOS/Schmitt,
-0.3
0.3 x VDDPX_3
V
VSHYS
Schmitt hysteresis voltage
300
-
mV
VOH
High-level output voltage, CMOS
VDDPX_3 - 0.45
VDDPX_3
V
VOL
Low-level output voltage, CMOS
0.0
0.45
V
RPULL-UP
Pull-up resistance
20 K
60 K
Ω
RPULL-DOWN
Pull-down resistance
60 K
20 K
Ω
Table 5.4- 1 Digital IO voltage performance
5.3.2 SD card digital I/O characteristics
The SD card is powered by P2 supply; the power is 1.8V and 2.96V.the following table shows the SD card
digital I/O characteristics:
Parameter
Description
Min
Typical
Max
Units
VIH
High-level input voltage
1.27/0.625 x
VDDPX_2
-
2/V
0.3
V
VIL
Low-level input voltage
-0.3/-0.3
-
0.58/0.25 x
VDDPX_2
V
VHYS
Schmitt hysteresis voltage
100
-
-
mV
RPULL-UP
Pull-up resistance
10 K
-
100K
Ω
RPULL-DOWN
Pull-down resistance
10 K
-
100K
Ω
RKEEPER-UP
Keeper-up resistance
10 K
-
100K
Ω
RKEEPER-DOWN
Keeper-down resistance
10 K
-
100K
Ω
VOH
High-level output voltage
1.4/0.75 x
VDDPX_2
-
-/VDDPX_2
V
VOL
Low-level output voltage
0/0
-
0.45/0.125 x
VDDPX_2
V
Table 5.4- 2 SD digital IO voltage performance (1.8V/2.96V)