Preliminary User's Manual l MBLS1012AL UM 0001 l © 2019, TQ-Systems GmbH
Page 24
4.5.2
GPIOs
GPIO pins from different sources are available on the MBLS1012AL.
Native GPIOs
The TQMLS1012AL provides six GPIO signals on the configuration selected for the MBLS1012AL. All GPIO signals configured as
input are interrupt capable.
Table 29:
Electrical characteristics of 1.8 V GPIOs
Wert
Min.
Typ.
Max.
Unit
Remark
Voltage level
–
1.8
–
V
–
Output impedance
30
45
60
Ω
Preliminary values, see (1), table 5
Switchable load high
–0.5
–
–
mA
See (1), table 33
Switchable load Low
0.5
–
–
mA
See (1), table 33
Attention: GPIO1_29
GPIO1_29 can only be configured as an output.
This pin must not be pulled low during the reset cycle!
See also (1), table 1 (GPIO1_29) note 5, and (2), chapter 20.1.
Port Expander GPIO:
Two GPIO port expanders are used (see also section 4.5.3), of which three pins are available on the header.
GPIO pins which are implemented via a port expander are usually not suitable for time-critical I/O operations due to their indirect
connection to the CPU. In addition, it should be noted that these pins are only available with a delay at boot time, since the I
2
C
driver must first be loaded for the configuration.
The nominal signal level of the GPIO signals GPIO_3V3_[3:1] is 3.3 V. The GPIO signals GPIO_3V3_[3:1] have a nominal signal level
of 3.3 V. However, the pins are 5 Volt tolerant and can be operated with an external signal level up to a maximum of 5.5 V. The
GPIO signals can be used with a maximum of 5.5 V.
At the pins GPIO_3V3_[3:1], a current of max. 25 mA can be switched). For more detailed information, refer to the data sheet of
the port expander.
Table 30:
GPIO assignment
Pin on header (X22)
Target pin / Net
Location
Signal level
Remark
25
GPIO1_29
X22
1.8 V
See above attention note
23
GPIO1_28
X22
1.8 V
–
–
GPIO1_27
–
1.8 V
Interrupt input, 8-Pin GPIO-Expander
21
GPIO1_26
X22
1.8 V
–
19
GPIO1_25
X22
1.8 V
–
–
GPIO1_24
–
1.8 V
Interrupt input, 16-Pin GPIO-Expander
16
GPIO_3V3_1
X22
3.3 V
5 V tolerant
18
GPIO_3V3_2
X22
3.3 V
5 V tolerant
20
GPIO_3V3_3
X22
3.3 V
5 V tolerant
