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参数资料
| 型号： | L9942XPTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24 |
| 封装： | LEAD FREE, POWER, SSO-24 |
| 文件页数： | 40/40页 |
| 文件大小： | 664K |
| 代理商： | L9942XPTR |
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L9942
Device description
2
Device description
2.1
Dual Power Supply: VS and VCC
The power supply voltage VS supplies the half bridges. An internal charge-pump is used to
drive the highside switches. The logic supply voltage VCC (stabilized) is used for the logic
part and the SPI of the device. Due to the independent logic supply voltage the control and
status information will not be lost, if there are temporary spikes or glitches on the power
supply voltage. In case of power-on (VCC increases from under voltage to VPOR OFF = 2.60
V, typical) the circuit is initialized by an internally generated power-on-reset (POR). If the
voltage VCC decreases under the minimum threshold (VPOR ON = 2.45 V, typical), the
outputs are switched to tristate (high impedance) and the internal registers are cleared.
2.2
Standby-Mode
The EN input has a pull-down resistor. The device is in standby mode if EN input isn't set to
a logic high level. All latched data will be cleared and the inputs and outputs are switched to
high impedance. In the standby mode the current at VS (VCC) is less than 3 A (1A) for
CSN = high (DO in tristate). If EN is set to a logic high level then the device will enter the
active mode. In the active mode the chargepump and the supervisor functions are activated.
2.3
Diagnostic Functions
All diagnostic functions (overload/-current, open load, power supply over-/undervoltage,
temperature warning and thermal shutdown) are internally filtered (tGL = 32s, typical) and
the condition has to be valid for a minimum time before the corresponding status bit in the
status registers will be set. The filters are used to improve the noise immunity of the device.
Open load and temperature warning function are intended for information purpose and will
not change the state of the bridge drivers. On contrary, the overload/-current and thermal
shutdown condition will disable the corresponding driver (overload/-current) or all drivers
(thermal shutdown), respectively. The microcontroller has to clear the status bit to reactivate
the bridge driver.
2.4
Over-voltage and Under-voltage Detection
If the power supply voltage VS rises above the over-voltage threshold VSOV OFF (typical 20
V), the outputs are switched to high impedance state to protect the load. When the voltage
VS drops below the undervoltage threshold VSUV OFF (UV-switch-OFF voltage), the output
stages are switched to the high impedance to avoid the operation of the power devices
without sufficient gate driving voltage (increased power dissipation). Error condition is
lached and the microcontroller needs to clear the status bits to reactivate the drivers.
2.5
Temperature Warning and Thermal Shutdown
If junction temperature rises above Tj TW a temperature warning flag is set which is
detectable via the SPI. If junction temperature increases above the second threshold Tj SD,
the thermal shutdown bit will be set and power DMOS transistors of all output stages are
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