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UM0240 Datasheet(PDF) 11 Page - STMicroelectronics

Part # UM0240
Description  ST Industrial Communication Board - EVALCOMMBOARD
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0240 Datasheet(HTML) 11 Page - STMicroelectronics

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UM0240
Power supply
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The connection between the charge pump output and the Vpp line is switched by the P-
MOS STS5DPF20L controlled by pin PF1 of the microcontroller.
This separates the IAP and In-Circuit Programming (ICP) and delivers VPP with a shorter
rising time.
The switch is closed when PF1 is low.
2.3
OpAmp negative supply (-5V)
The last power supply consists of a non-regulated negative charge pump derived from the
pin C1- of the ST622A, which works as an oscillator between 0V and VCC for the negative
charge pump composed by the two diodes, D14 and D15, and the two capacitors, C35 and
C36. This supply is used as negative supply for the two OPAMP U3A and U3B of LM358, in
order to provide them a complete rail-to-rail output range between -5V and VDD.



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