参数资料
型号: KIT34844AEPEVBE
厂商: Freescale Semiconductor
文件页数: 20/62页
文件大小: 0K
描述: KIT EVAL BOARD 10CH LED BACKLGHT
标准包装: 1
系列: *
MC34844
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
shorted LED happens to be in the LED string with the highest
forward voltage, the DHC circuit will automatically regulate
the output voltage with respect to the new highest LED
voltage. If more LEDs are shorted in the same LED string, it
may cause excessive power dissipation in the channel which
may cause the OTT circuit to trip which will completely
shutdown the device.
OVER-TEMPERATURE PROTECTION
The 34844 has an on-chip temperature sensor that
measures die temperature. If the IC temperature exceeds the
OTT threshold, the IC will turn off all power sources inside the
temperature falls below the falling OTT threshold. Once it
comes back on, it will operate with the default configuration
(refer to Table 7 ).
SERIAL INTERFACE CONTROL
The 34844 uses an I 2 C interface capable of operating in
standard (100 kHz) or fast (400 kHz) modes.
The A0/SEN pin can be used an address select pin to
allow more than 2 devices in the system. The A0/SEN pin
should be held low on all chips expect the one to be
addressed, where it is taken HIGH.
IC (LED drivers, boost and internal regulators) until the
34844
Analog Integrated Circuit Device Data
Freescale Semiconductor
20
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