參數(shù)資料
型號(hào)： MCZ33689DEW
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： System Basis Chip with LIN Transceiver
中文描述： 系統(tǒng)基礎(chǔ)芯片的LIN收發(fā)器
文件頁(yè)數(shù)： 21/31頁(yè)
文件大?。?/td> 309K
代理商： MCZ33689DEW
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
33689
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
WINDOW WATCHDOG
The window watchdog can be configured using an external
resistor at
WDC
pin. The watchdog is cleared through
MODE1 and MODE2 bit in the SPI Register (refer to
Table 2
,
page
24
; also refer to the section entitled
Functional Pin
Description on page 19
.
A watchdog clear is only allowed in the open window (see
Figure 1
). If the watchdog is cleared in the closed window or
has not been cleared at the end of the open window, the
watchdog will generate a reset on the
RST
pin and reset the
whole device.
Note
The watchdog clear in Normal request mode
(150 ms) (first watchdog clear) has no window.
Figure 1. Window Watchdog Operation
Window Watchdog Configuration
If the
WDC
pin is left open, the default watchdog period is
selected (typ. 150 ms). If no watchdog function is required,
the
WDC
pin must be connected to GND.
The watchdog timer’s period is calculated using the
following formula:
t
WDC
= 0.991
*
R +0.648
(with R in k
and t
WDC
in ms).
VDD VOLTAGE REGULATOR
The 33689 chip contains a low-power, low dropout voltage
regulator to provide internal power and external power for the
MCU. The on-chip regulator consist of two elements, the
main voltage regulator and the low-voltage reset circuit.
The VDD regulator accepts an unregulated input supply
and provides a regulated V
DD
supply to all digital sections of
the device. The output of the regulator is also connected to
the VDD pin to provide the 5.0 V to the microcontroller.
Current Limit (Overcurrent) Protection
The voltage regulator has current limit to protect the device
against overcurrent and short circuit conditions.
Overtemperature Protection
The voltage regulator also features overtemperature
protection that has an overtemperature warning (Interrupt -
VDDT) and an overtemperature shutdown.
Stop Mode
During Stop mode, the Stop mode regulator supplies a
regulated output voltage. The Stop mode regulator has a
limited output current capability.
Sleep Mode
In Sleep mode, the voltage regulator external VDD is
turned off.
VDD VOLTAGE REGULATOR TEMPERATURE
PREWARNING
VDD voltage regulator temperature prewarning (VDDT) is
generated if the voltage regulator temperature is above the
T
PRE
threshold. It will set the VDDT bit in the SPI Register
and an interrupt will be initiated. The VDDT bit remains set as
long as the error condition is present.
During Sleep and Stop modes the VDD voltage regulator
temperature prewarning circuitry is disabled.
HIGH-SIDE SWITCH THERMAL SHUTDOWN
The high-side switch thermal shutdown HSST is
generated if one of the high-side switches HS1 : HS3 is above
the HSST threshold. It will shutdown all high-side switches
and set the HSST flag in the SPI Register, and an interrupt
will be initiated. The HSST bit remains set as long as the error
condition is present. During Sleep and Stop modes the high-
side switch thermal shutdown circuitry is disabled.
Window Closed.
No Watchdog Clear Allowed
Window Open
for Watchdog Clear
t
WDC
* 50%
t
WDC
* 50%
Watchdog Period
t
WDC
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