TQ Ma8XxS, Руководство пользователя

Страница: 30 / 50

User's Manual l TQMa8XxS UM 0101 l © 2022, TQ-Systems GmbH Page 25
The following table shows the addresses of the I
2
C devices used on the TQMa8XxS:
Table 14: I 2 C addresses
Bus Device Function Address Remark
I2C0 (I2C_GP)
24LC64 EEPROM
0x50 / 101 0000b
–
PCF85063 RTC
0x51 / 101 0001b
–
SE050 TSE
0x48 / 100 1000b
SE97BTP
Temperature sensor
0x1B / 001 1011b
Access to temperature registers
EEPROM
0x53 / 101 0011b
R/W access in Normal Mode
EEPROM
0x33 / 011 0011b
R/W access in Protected Mode
PCIe clock driver
0x6A / 110 1010b
PMIC_I2C (I2C_PM) PF8x00 PMIC
0x08 / 000 1000b
Should not be altered
DSI0_I2C (I2C_LCD) DisplayPort-Bridge
0x0F / 000 1111b
3.3.13 GPIO
The SMARC standard specifies a total of 12 GPIOs. The standard recommends to use GPIO0...5 preferably as output and
GPIO6...11 preferably as input. The i.MX 8X GPIOs can be used in both directions. GPIO11 cannot be used as GPIO because it is
not connected on the module.
A special alternative use is provided for GPIO5 and GPIO6, which are intended as PWM output or tachometer input. These two
signals are therefore connected to CPU balls, which can be used as GPIO or as PWM output or timer capture input.
Some of the GPIO pins used can be multiplexed as ADC input. The ADC reference voltage of the i.MX 8X is connected to 1.8 V by
default. The reference voltage can also be applied externally through the GPIO0 pin using the placement option.
Additional interfaces are available at the GPIO pins used for multiplexing. The following table lists the connected default GPIOs
and their possible alternative functions.
Table 15: GPIO pins and alternative functions
SMARC pin GPIO (default) ADC SPI I 2 C / UART Other
GPIO0 GPIO1_IO04 VREF
2
SPI0_SCK M4_I2C0_SCL M4_GPIO0_IO00
GPIO1 GPIO1_IO05 – SPI0_SDI – M4_TPM0_CH0
GPIO2 GPIO1_IO06 – SPI0_SDO M4_I2C0_SDA M4_GPIO0_IO01
GPIO3 GPIO1_IO08 – SPI0_CS0 – M4_TPM0_CH1
GPIO4 GPIO1_IO13 ADC_IN5 – – M4_GPIO0_IO05
GPIO5 GPIO0_IO22 – – UART1_RX PWM1_OUT
GPIO6 GPIO0_IO21 – – UART1_TX GPT0_CAPTURE
GPIO7 GPIO1_IO10 ADC_IN0 – M4_I2C0_SCL M4_GPIO0_IO00
GPIO8 GPIO1_IO09 ADC_IN1 – M4_I2C0_SDA M4_GPIO0_IO01
GPIO9 GPIO1_IO12 ADC_IN2 – M4_UART0_RX M4_GPIO0_IO02
GPIO10 GPIO1_IO11 ADC_IN3 – M4_UART0_TX M4_GPIO0_IO03
GPIO11 NC – – – –
The SMARC specification allows the use of chip-internal pull-up configurations instead of discrete pull-up resistors. Therefore, in
order not to influence the possible alternative functions, discrete resistors are not used, instead internal pull-ups of the i.MX 8X
are to be used. In addition, after reset on the CPU balls, the internal pull-down resistors are active, which must be switched off
during boot. At the same time the internal pull-up resistors can be enabled.
2: Placement option.