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參數資料
| 型號： | L9942XP1TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24 |
| 封裝： | ROHS COMPLIANT, SSOP-24 |
| 文件頁數： | 40/40頁 |
| 文件大小： | 639K |
| 代理商： | L9942XP1TR |
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L9942
Device description
Doc ID 11778 Rev 6
9/40
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 undervoltage 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 = 2.3 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 (1 A) 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 charge pump 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 = 32 s, 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
Overvoltage and undervoltage detection
If the power supply voltage Vs rises above the overvoltage threshold VSOV OFF (typical
21 V), an overvoltage condition is detected. Programmable by SPI (OVW) the outputs are
switched to high impedance state (default after reset) or the overvoltage bit is set without
switching the outputs to high impedance. When the voltage Vs drops below the under-
voltage threshold VSUV OFF, the outputs are switched to high impedance state to avoid the
operation of the power devices without sufficient gate driving voltage (increased power
dissipation). Error condition is latched and the microcontroller needs to clear the status bits
to reactivate the drivers.
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