參數(shù)資料
型號(hào)： L99H01QF
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSH DC MOTOR CONTROLLER, PQFP32
封裝： 7 X 7 MM, ROHS COMPLIANT, LQFP-32
文件頁(yè)數(shù)： 24/53頁(yè)
文件大小： 1129K
代理商： L99H01QF
L99H01
Doc ID 15567 Rev 3
3.8
Temperature warning and thermal shutdown
If junction temperature rises above TjTWON the temperature warning flag TW is set and is
detectable via the SPI. If junction temperature increases above the second threshold
TjSDON, the thermal shutdown bit (TSD) is set. The gate drivers and the charge pump are
switched-off to protect the device. The gates of the H-bridge are discharged by the resistive
low mode (see Section 3.4). In order to reactivate the output stages the junction
temperature must decrease below TjSDOFF and the thermal shutdown bit has to be cleared
by the microcontroller.
3.9
Short-circuit detection / drain source monitoring
The drain - source voltage of each activated external MOSFET of the H-bridge is monitored
by comparators to detect shorts to ground or battery. If the voltage drop over the external
MOSFET exceeds the threshold voltage VSCd for longer than the short current detection
time tSCd the corresponding gate driver switches the external MOSFET off and the
corresponding drain source monitoring flag (DS_MON [3:0]) is set. Until this failure flag is
reseted the corresponding half bridge is in sink condition. The DS_MON bits have to be
cleared through a software reset to reactivate the gate drivers. The drain source monitoring
has a filter time of 6 s. This monitoring is only active when the corresponding gate driver is
in source condition. The threshold voltage VSCd can be programmed in 4 steps between
0.5 V and 2 V with the SPI.
3.10
Programmable cross current protection
The external Power MOSFET’s transistors in H-bridge (two halfbridges) configuration are
switched-on with an additional delay time tCCP to prevent cross current in the halfbridge. The
cross current protection time tCCP can be programmed with the SPI.
3.11
Current sense amplifier (CSA)
The current sense amplifier (CSA) is specially designed for current shunt automotive
applications. It is a bidirectional, single-supply difference amplifier for amplifying small
differential voltages in a wide common mode voltage range (-4 V to (VCP - 8) V). It supports
the current measurement at two shunts. The result of respective shunt can be multiplexed to
the microcontroller compatible output voltage by a SPI command.
A gain of 50, 20 or 10 is SPI programmable. The inputs (CSI1+ / CSI1- and CSI2+ / CSI2-)
are build as a transconductance stage. Therefore a series resistor (for filtering etc.) should
not exceed 50
Ω to keep the additional gain error below 1%.
The output works at half scale: VCSO0 = (0,5 * VCC) V for VIDIFF = 0 V. An internal offset
measurement is in normal mode available with the "OFF_CAL" SPI-bit. If this bit is set to
logic "1" the input pins are disconnected from the amplifier and a virtual zero input
differential voltage is selected.
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