PROTECTION AND DIAGNOSIS FEATURES PROTEC" />
參數(shù)資料
型號(hào)： MCZ33797EKR2
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 20/36頁(yè)
文件大?。?/td> 0K
描述： IC SQUIB DRIVER 2CHAN 32-SOIC
標(biāo)準(zhǔn)包裝： 1,000
系列： *
應(yīng)用： *
接口： *
電源電壓： *
封裝/外殼： 32-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 32-SOIC
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
Freescale Semiconductor
27
33797
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
PROTECTION AND DIAGNOSIS FEATURES
The diagnostic circuit’s internal references are provided by a
bandgap voltage reference, and by scaled currents
determined by the resistor value of R_DIAG and the value of
the bandgap voltage. Refer to Table 8, and Table 9, as
necessary throughout this section.
R_DIAG and R_LIMIT_X RESISTOR DIAGNOSTICS
($C8 COMMAND)
This function monitors reference currents derived by the
R_LIMIT_1, R_LIMIT_2, and R_DIAG resistors. An open pin
or short to ground will cause the comparator to give an “out
of range resistor value” indication. A short to VDD will have
the same effect as an open pin and will cause an “out of range
resistor value” indication.
R_LIMIT_X and R_DIAG DATA RESULTS
If R_LIMIT_X is open, shorted to ground, or shorted to VDD,
the bit R_LIMIT_NO_FAULT will be set to “0”. Standard
operation will have this bit set to “1”.
If R_DIAG is open, shorted to ground, or shorted to VDD, the
bit R_DIAG_NO_FAULT will be set to “0”. Standard operation
will have this bit set to “1”.
The FEN 1 and FEN 2 status bits are a reflection of the
FEN_1 and FEN_2 pins.
HIGH SIDE SAFING SENSOR DIAGNOSTICS
($C0 COMMAND)
This function monitors the VFIRE_XX pin connection to the
VDIAG_X pin. The high side safing function is attached to the
VFIRE _1A and VFIRE_2A pins. The high side safing
function is not available on the VFIRE _1B and VFIRE_2B
pins.
When enabled, this diagnostic circuit will typically draw less
than 500 A from the VFIRE supply voltage source.
Internal window comparators will monitor the voltage
difference between the VDIAG_X pin and the VFIRE_XX pin,
and will provide two bits of data to indicate if the pin voltage
is either above (open) or below (shorted) the threshold levels.
When using a high side safing sensor, typical 5.1 k
reference resistor must be placed across the sensor to
provide a current path for the diagnostic circuit. As long as
there is a current path and the safing sensor switch is open,
the resulting differential voltage will fall between the
comparator thresholds so neither an open fault nor a shorted
fault condition will be indicated. A closed safing sensor will be
Hex
Code
Command
Description
Command Programming Input and Diagnostic Data Out (Available on Next Command) (23)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
90
Reserved for
Freescale Read
NVM Low
X
91
Reserved for
Freescale Read
NVM High
X
92
Reserved for
Freescale NVM
Enable
X
93
Reserved for
Freescale Test
Mode Enable
X
96
SPI Integrity Check
1
0
1
0
1
0
Response DATA
OUT: $69 Echo to
Diagnose the SPI
Integrity
0
1
0
1
0
1
Notes
23
The second byte for command programming will be treated as a NOP if any FET is firing. The programming commands have to be
sequential or they will be treated as a NOP.
Table 9. Command Programming and Diagnostic Bit Definitions (continued)
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