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參數(shù)資料
| 型號： | MCZ33905BD3EK |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 44/106頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SBC CAN HS 3.3V 54SOIC |
| 標準包裝： | 26 |
| 應用： | 系統(tǒng)基礎芯片 |
| 接口： | CAN，LIN |
| 電源電壓： | 5.5 V ~ 28 V |
| 封裝/外殼： | 54-SSOP（0.295"，7.50mm 寬）裸露焊盤 |
| 供應商設備封裝： | 54-SOICW-EP |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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Analog Integrated Circuit Device Data
42
Freescale Semiconductor
33903/4/5
FUNCTIONAL DEVICE OPERATION
MODE CHANGE
MODE CHANGE
“SECURED SPI” DESCRIPTION:
A request is done by a SPI command, the device provide
on MISO an unpredictable “random code”. Software must
perform a logical change on the code and return it to the
device with the new SPI command to perform the desired
action.
The “random code” is different at every exercise of the
secured procedure and can be read back at any time.
The secured SPI uses the Special MODE register for the
following transitions:
- from Normal mode to INT mode
- from Normal mode to Flash mode
- from Normal mode to Reset mode (reset request).
“Random code” is also used when the “advance
watchdog” is selected.
CHANGING OF DEVICE CRITICAL PARAMETERS
Some critical parameters are configured one time at
device power on only, while the batfail flag is set in the INIT
mode. If a change is required while device is no longer in INIT
mode, device must be set back in INIT mode using the “SPI
secure” procedure.
WATCHDOG OPERATION
IN NORMAL REQUEST MODE
In Normal Request mode, the device expects to receive a
watchdog configuration before the end of the normal request
time out period. This period is reset to a long (256 ms) after
power on and when BATFAIL is set.
The device can be configured to a different (shorter) time
out period which can be used after Wake-up from LP VDD on
mode.
After a software watchdog reset, the value is restored to
256 ms, in order to allow for a complete software initialization,
similar to a device power up.
In Normal Request mode the watchdog operation is
“timeout” only and can be triggered/observed any time within
the period.
WATCHDOG TYPE SELECTION
Three types of watchdog operation can be used:
- Window watchdog (default)
- Timeout operation
- Advanced
The selection of watchdog is performed in INIT mode. This
is done after device power up and when the BATFAIL flag is
set. The Watchdog configuration is done via the SPI, then the
Watchdog mode selection content is locked and can be
changed only via a secured SPI procedure.
Window Watchdog Operation
The window watchdog is available in Normal mode only.
The watchdog period selection can be kept (SPI is selectable
in INIT mode), while the device enters into LP VDD ON mode.
The watchdog period is reset to the default long period after
BATFAIL.
The period and the refresh of watchdog are done by the
SPI. A refresh must be done in the open window of the
period, which starts at 50% of the selected period and ends
at the end of the period.
If the watchdog is triggered before 50%, or not triggered
before end of period, a reset has occurred. The device enters
into Reset mode.
Watchdog in Debug Mode
When the device is in Debug mode (entered via the DBG
pin), the watchdog continues to operate but does not affect
the device operation by asserting a reset. For the user,
operation appears without the watchdog.
When Debug mode is left by software (SPI mode reg), the
watchdog period starts at the end of the SPI command.
When Debug mode is left by hardware (DBG pin below 8-
10 V), the device enters into Reset mode.
Watchdog in Flash Mode
During Flash mode, watchdog can be set to a long timeout
period. Watchdog is timeout only and an INT pulse can be
generated at 50% of the time window.
Advance Watchdog Operation
When the Advance watchdog is selected (at INIT mode),
the refresh of the watchdog must be done using a random
number and with 1, 2, or 4 SPI commands. The number for
the SPI command is selected in INIT mode.
The software must read a random byte from the device,
and then must return the random byte inverted to clear the
watchdog. The random byte write can be performed in 1, 2,
or 4 different SPI commands.
If one command is selected, all eight bits are written at
once.
If two commands are selected, the first write command
must include four of the eight bits of the inverted random byte.
The second command must include the next four bits. This
completes the watchdog refresh.
If four commands are selected, the first write command
must include two of the eight bits of the inverted random byte.
The second command must include the next two bits, the 3rd
command must include the next two, and the last command,
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33905BD3EKR2 | 功能描述:CAN 接口集成電路 3.3V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MCZ33905BD3R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
| MCZ33905BD5EK | 功能描述:CAN 接口集成電路 5.0V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MCZ33905BD5EKR2 | 功能描述:CAN 接口集成電路 5.0V SBC HSCAN DUAL LIN RoHS:否 制造商:Texas Instruments 類型:Transceivers 工作電源電壓:5 V 電源電流: 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MCZ33905BD5R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:SBC Gen2 with CAN High Speed and LIN Interface |
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