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FS6407 bảng dữ liệu(PDF) 55 Page - NXP Semiconductors

tên linh kiện FS6407
Giải thích chi tiết về linh kiện  Power system basis chip with high speed can transceiver
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nhà sản xuất  NXP [NXP Semiconductors]
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FS6407 bảng dữ liệu(HTML) 55 Page - NXP Semiconductors

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FS6407/FS6408
6.7.8
Start-up sequence
To provide a safe and well known start-up sequence, the FS6407/FS6408 includes an undervoltage lock-out. This undervoltage lock-out
is only applicable when the device is under a Power-On-Reset condition, which means the initial condition is VSUP < VSUP_UV_L (i.e. below
2.7 V max). In all the other conditions (i.e. LPOFF), the device is able to operate (and therefore to restart) down to VSUP_UV_L. The other
different voltage rails automatically start, as described in Figure 39.
Figure 39. Start-up scheme
The final value of VAUX and VCCA depends on the hardware configuration (resistor values on the SELECT pin). The typical start up
sequence takes around 16 ms to release RSTB. RSTB can be pulled low after those 16 ms by the MCU, if it is not ready to run after power
up. If an internal or external fault happen during this start up phase (ABIST fault due to regulator shorted for example), the 8.0 s timer
monitoring the RSTB pin low, finally sends the device in Deep Fail-safe mode after 8.0 s.
~16ms
Vsup
Vint_2.5
Vpre
Vsup_uv_5
UV Lock-out
Vpre_uv
Vpre_EN
Vcca/Vaux
Vcore
RSTB
INTB
(Vddio=Vcore)
Select pin
1ms
LBIST
120us
1ms



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