Renesas S3A1, Руководство пользователя

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Target Board Kit S3A1 (TB-S3A1) Hardware Layout
R12UM0022EU0100 Rev.1.00 Page 11 of 36
Feb 6, 2018
Figure 10 E6 on target board (top side)
Figure 11 E6 on target board (bottom side)
Once the shorting traces have been removed, there are several options to measure current:
•
Pins can be installed that allow connection of a precision multi-meter or bench meter, or leaded current shunt to
allow oscilloscope or data logger connection. When not measuring current, this allows easily installed and removed
shunts to be used to short the jumper terminals.
•
Another option is to install current sense resistors between pads 1 and 3 for +3V3MCU, and between pads 2 and 4
for VBAT. Precision non-inductive film or foil resistors are recommended for use in this application, and the value
of each resistor should be carefully considered.
For example, if the expected current requirement for the +3V3 MCU supply voltage is 10 mA, and you would
expect to measure a 10 mV drop across the current measurement resistor, then a 1.0 ohm resistor should be selected
and installed.
The actual value selected should be based on the operating conditions of the MCU for your specific application, and
the sensitivity of the measurement equipment used.
4.3 Major components
Main MCU
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Renesas S3A1 MCU, part number R7FS3A17C3A01CFB#AA0 (U1)
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Main MCU
J-Link MCU
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Renesas S124 MCU, part number R7FS124773A01CFM#AA0 (U2)
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J-Link MCU
USB Connectors
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FCI, part number 10118192-0001LF (J9, J11)
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Micro USB 2.0 Female connector
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Primary communication with Main MCU and J-Link MCU
Push-buttons
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C&K, part number PTS645SM43SMTR92 LFS (S1, S2)
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Momentary push-button switch
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Used for system reset and user defined functions
LDO Regulator
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Diodes Inc., part number AP7215-33YG-13 (U3)