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L9788 bảng dữ liệu(PDF) 42 Page - STMicroelectronics

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L9788 bảng dữ liệu(HTML) 42 Page - STMicroelectronics

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Operation behavior
L9788
42/264
DS12308 Rev 4
3.4
Smart reset circuit
There are two Reset pins:
1.
RSTN: reset pin linked to VDD5 supply;
2.
RSTC: reset pin linked to VDDIO supply.
3.4.1
Smart reset RSTN pin
The RSTN pin is an input/output active low. As output pin the Smart Reset circuit takes into
account several events in the device in order to generate the proper reset signal at RSTN
pin for the microcontroller and for portion of the internal logic as well.
The RSTN in output (RSTN(OUT) is activated by the contributions described by the reset
matrix and is intended as reset for the external microcontroller.
The RSTN in input (RSTN(IN)) is filtered Trst_flt_RST and stops the internal logic as
described in the reset matrix.
The internal RSTN(OUT) has higher priority respect to the external RSTN(IN). The
RSTN(IN) is masked until Tmsk_RSTN after RSTN(OUT) has been released.
RSTN(OUT) and RSTN(IN) are recombined on the pad according to the scheme.
Figure 14. Reset circuit
The RSTN activates on the contributions specified by the reset matrix:
Figure 15. Reset matrix
GADG2511160825PS
RSTN(OUT)
RSTN(IN)
RSTN pin
1
1
0
100μs
GADG2511161010PS
VDDIO
RSTC
LOGIC
VDDIO uv = 0 pull up connected
VDDIO uv = 1 pull up disconnected
VDDIO uv = 0 LS OFF
VDDIO uv = 1 LS ON



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