參數(shù)資料
型號(hào)： MCZ33991EG
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Gauge Driver Integrated Circuit
中文描述： 儀表驅(qū)動(dòng)集成電路
文件頁(yè)數(shù)： 27/36頁(yè)
文件大?。?/td> 481K
代理商： MCZ33991EG
Analog Integrated Circuit Device Data
Freescale Semiconductor
27
33991
TIMING DESCRIPTIONS AND DIAGRAMS
APPLICATION INFORMATION
functions and internal registers will operate as though all of
the addressable configuration register bits were set to
logic[0]. This means, for example, all of the outputs will be
disabled after a power-up or external reset, SO flag ST6 is
set, indicating an under voltage event. Anytime an external
reset is exerted and the default is restored, all configuration
parameters, e.g., clock calibration, maximum speed, RTZ
parameters, etc. are lost and must be reloaded.
FAULT LOGIC REQUIREMENTS
The 33991 device indicates each of the following faults as
they occur:
Over temperature fault
Out- of- range voltage faults
Clock out of specification
Over current faults are not reported directly; however, it is
likely an over current condition will become a thermal issue
and be reported.
OVER TEMPERATURE FAULT REQUIREMENTS
The 33991 incorporate over temperature protection
circuitry, shutting off the affected Gauge Driver when
excessive temperatures are measured. In the event of a
thermal overload, the affected gauge driver will be
automatically disabled. The over temperature fault is flagged
via ST0 and/or ST1. Its respective flag continues to be set
until the affected gauge is successfully re-enabled, provided
the junction temperature falls below the hysteresis level.
OVER VOLTAGE FAULT REQUIREMENTS
The device is capable of surviving V
PWR
voltages within
the maximum specified in the
Maximum Ratings Table
. V
PWR
levels resulting in an Over Voltage Shut Down condition can
result in uncertain pointer positions. Therefore, the pointer
position should be re-calibrated. The master will be notified of
an over voltage event via the ST6 flag on the SO pin. Over
voltage detection and notification will occur regardless of
whether the gauge(s) are enabled or disabled.
Note:
There is no way to distinguish between an over
voltage fault and an under voltage fault from the status bits. If
there is no external means for the micro controller to
determine the fault type, the gauges should be routinely
enabled following the transition to logic [0] of ST6.
OVER CURRENT FAULT REQUIREMENTS
Output currents will be limited to safe levels, then the
device will rely on Thermal Shutdown to protect itself.
UNDER VOLTAGE FAULT REQUIREMENTS
Severe under voltage V
PWR
conditions may result in
uncertain pointer positions; therefore, recalibration of the
pointer position may be advisable. During an under voltage
event, the state machine and outputs will continue to operate
although the outputs may be unable to reach the higher
voltage levels. The master is notified of an under voltage
event via the SO pin. Under voltage detection will occur
regardless whether the gauge(s) are enabled or disabled.
Note:
There is no way to distinguish between an over
voltage fault and an under voltage fault from the status bits. If
there is no external means for the micro controller to
determine the fault type, the gauges should be routinely
enabled following the transition to logic [0] of ST6.
ELECTRICAL REQUIREMENTS
All voltages specified are measured relative to the device
ground pins unless otherwise noted. Current flowing into the
33991is positive, while current flowing out of the device is
negative.
RESETS (SLEEP MODE)
The device can reset internally or externally. If the V
DD
level falls below the V
DDUV
level, specified in the
Static
Electrical Characteristics
, the device resets and powers up in
the Default mode. Similarly, If the RST pin is driven to a logic
[0], the device resets to its default state. The device
consumes the least amount of current (
Idd
and
Ipwr
) when
the RST pin is logic[0]. This is also be referred to as the Sleep
mode.
APPLICATION INFORMATION
The 33991 is an extremely versatile device used in a
variety of applications. Table 15, and the sample code,
provides a step-by-step example of configuring using many
of the features designed into the IC. This example is intended
to give a generic overview of how the device could be used.
Further, it is intended to familiarize users with some of its
capabilities. In Steps 1-9, the gauges are enabled, the clock
is calibrated, the device is configured for RTZ, and the
pointers are calibrated with the RTZ command. Steps 1-9 are
representative of the first steps after power-up. Maximum
velocity is set in Step 10, if necessary. In Steps 11 and 12,
pointers are commanded to the desired positions by the
master. These steps are the most frequently used during
normal operation. Steps 13 -15 place the pointer close to the
zero position prior to the initiation of the RTZ commands in
Steps 16-19. Step 20 disables the gauges, placing them into
a Low Quiescent Current mode.
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