TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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PWM Block The integrated PWM block provides up to 4 PWM channels. PWM frequency and duty cycle
as well as polarities and dead times are configurable. The outputs can be configured for a safe state in
case of emergency.
Generic SPI Master Interface The TMC8462 provides a generic SPI master interface to connect to on-
or off-board SPI slave peripherals like ADCs, sensors, or motor drivers. The SPI master interface is fully
configurable and offers 4 slave select lines.
Generic I2C Master Interface A generic I2C master interface is also available in TMC8462 to connect to
I2C slaves. The I2C bus speed is configurable.
Digital DAC A simple digital 16 bit DAC channel is available which requires an external RC circuit for
operation.
Safety Functions The following safety functions are available with the TMC8462
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Configurable watchdog functionality for the MFC IO block to monitor internal and external signals as
well as EtherCAT activity. This block is fully configurable.
A general emergency switch input can be activated. For critical outputs, a safe state can be configured
which is used when the emergency switch triggers.
A common IRQ signal is available at the MFC IO block which can be mapped to various events of the
MFC IO block. The IRQ events can be processed by a local application controller.
3.4 Analog and High Voltage Block
TMC8462 has an integrated powerful high voltage sub block that provides analog functions and high
voltage support to your EtherCAT slave. The integrated high voltage capabilities allow for BOM reduction
and save board space. More information is available in Section 7.21.
High Voltage Ports 8 of the 24 configurable IO ports of the MFC IO block are high voltage IO ports. For
pure digital systems operating at 3.3V or 5V these ports can simply be used as standard IO ports. When
using a higher supply voltage at the VIOx inputs the high voltage ports can be used at up to 35V (5V, 12V,
24V typical). The 8 high voltage ports are grouped into 3 groups with 2, 3, and 3 ports. Each group can be
used a different supply voltage level using VIO1, VIO2, and VIO3 inputs.
Each high voltage port has a short circuit protected push-/pull or open drain output stage with 100mA
drive current (ca. 200mA short time) and can be combined with any signal of the MFC IO block functions.
The outputs’ slope can be controlled. An optional input filter is selectable as well as pull downs or pull ups
with 100µA.
The high voltage ports have an over-temperature shutdown.
When driving inductive loads a freewheeling diode must be provided to the high
voltage I/O pins to prevent from latch-up.
WARNING
Switching Regulators Two switching regulators (buck regulators) are integrated into TMC8462 – SW0
and SW1. Both are capable of driving up to 500mA.
SW0 generates a fixed 3.3V rail for internal and external logic supply. SW1 is programmable between 3.3V
and VS (up to 24V) and can be used for peripheral supply, e.g, to generate a 5V encoder supply.
Each switching regulator comes with a separate over-temperature shutdown.
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