OPERATIONAL MODES FUNCTIONAL DEVICE OPERATI" />
參數(shù)資料
型號: MCZ33661EFR2
廠商: Freescale Semiconductor
文件頁數(shù): 6/22頁
文件大?。?/td> 0K
描述: IC LIN INTERFACE PHYSICAL 8-SOIC
標準包裝: 2,500
系列: *
應(yīng)用: *
接口: *
電源電壓: *
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOICN
包裝: 帶卷 (TR)
安裝類型: 表面貼裝
Analog Integrated Circuit Device Data
14
Freescale Semiconductor
33661
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
As described in the following, and as depicted in Figure 15
and Table 5, the 33661 has two operational modes, Normal
and Sleep. Normal mode may be adjusted to improve
radiated emissions by changing the slew rate of the LIN bus
output to Fast or Slow mode. In addition, there are two
transitional modes: Awake mode, which allows the device to
go in Normal or Slow mode, and Wait Slow mode, which is a
temporary state before the device enters the Slow mode.
NORMAL MODE
In the Normal mode, the 33661 has slew rate and timing
compatible with the LIN protocol specification, and operates
from 1.0 kbps to 20 kbps. This mode is selected after Sleep
mode by setting the TXD pin High prior to setting EN from
Low to High. Once Normal mode is selected, it is impossible
to select the Slow mode unless the 33661 is set into Sleep
mode.
Slow Mode
In the Slow mode, the slew rate is around half the normal
slew rate, and bus speed operation ranges from 1.0 kbps to
10 kbps. The radiated emission is significantly reduced
compared to the already excellent emission level of the
Normal mode. Slow mode is entered after Sleep mode by
setting the TXD pin Low prior to setting EN from Low to High.
Once the Slow mode is selected, it is impossible to select the
Normal mode unless the device is set to Sleep mode.
Fast Mode
In the Fast mode, the slew rate is around 10 times faster
than the Normal mode. This allows very fast data
transmission (>100 kbps)—for instance, for electronic
control unit (ECU) tests and microcontroller program
download. The bus pull-up resistor might be reduced to
ensure a correct RC time constant in line with the high baud
rate used.
Fast mode can be selected from either Normal or Slow
mode. Fast mode is entered via a special sequence (called
toggle function) as follows: TXD and EN pins set Low, then
TXD pulled High, and at the EN pin Low-to-High transition,
the device enters into the Fast Baud rate. The duration of this
sequence must be less than 35 s. The toggle function is
described in Figure 13. Once in the Fast mode, two different
procedures will bring the device back to the previously
selected mode (Normal or Slow):
The toggle function already described.
A glitch on EN where t2 < 5.0 s also resets the device to
the previously selected mode (Normal or Slow)
SLEEP MODE
In the Sleep mode, the transmission path is disabled and
the 33661 is in Low Power mode. Supply current from VSUP
is very low. Wake-up can occur from LIN bus activity from
node internal wake-up through the EN pin and from the
WAKE input pin.
In the Sleep mode, the 33661 has an internal 20
A pull-
up source to VSUP. This avoids the high current path from
the battery to ground in the event the bus is shorted to
ground. (Refer to succeeding paragraphs describing wake-
up behavior.)
DEVICE POWER-UP (AWAKE TRANSITIONAL
MODE)
At power-up (VSUP rises from zero), the 33661
automatically switches to the Awake transitional mode. It
switches the INH pin to High state and RXD to Low state. The
MCU of the application will then confirm Normal or Slow
mode by setting the TXD and EN pins appropriately.
DEVICE WAKE-UP EVENTS
The 33661 can be awakened from Sleep mode by three
wake-up events:
Remote wake-up via LIN bus activity
Internal node wake-up via the EN pin
Toggling the WAKE pin
Remote Wake from LIN Bus (Awake Transitional Mode)
The LIN bus wake-up is recognized by a recessive-to-
dominant transition, followed by a dominant level with a
duration greater than 70
s, followed by a dominant-to-
recessive transition. This is illustrated in Figures 11 and 12.
Once the wake-up is detected, the 33661 enters the Awake
Transitional mode, with INH High and RXD pulled Low.
Wake-up from Internal Node Activity (Normal or Wait
Slow Mode)
The 33661 can wake-up by internal node activity through
a Low-to-High transition of the EN pin. When EN is switched
from Low-to-High, the device is awakened and enters either
the Normal or the Wait Slow transitional mode depending on
the level of TXD input. The MCU must set the TXD pin LOW
or HIGH prior to waking up the device through the EN pin.
Wake-up from WAKE Pin (Awake Transitional Mode)
If the WAKE input pin is toggled, the 33661 enters the
Awake transitional mode, with INH High and RXD pulled Low.
相關(guān)PDF資料
PDF描述
MCZ33781EKR2 IC MASTER DSI 2.02 DIFF 32-SOIC
MCZ33784EFR2 IC SENSOR DBUS DSI 2.02 16-SOIC
MCZ33793EF IC DSI SLAVE REMOTE SENS 16-SOIC
MCZ33797EKR2 IC SQUIB DRIVER 2CHAN 32-SOIC
MCZ33884EG IC MULTIPLE CONTACT MON 24-SOIC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCZ33661EFR2 制造商:Freescale Semiconductor 功能描述:IC LIN INTERFACE 制造商:Freescale Semiconductor 功能描述:IC, LIN INTERFACE
MCZ33689DEW 功能描述:輸入/輸出控制器接口集成電路 SBCLIN RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray
MCZ33689DEWR2 功能描述:輸入/輸出控制器接口集成電路 SBCLIN RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray
MCZ33730EK 功能描述:線性穩(wěn)壓器 - 標準 SW MODE P/S W/ MULT REG RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-323-5L
MCZ33730EK/R2 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Switch Mode Power Supply with Multiple Linear Regulators