User Guide
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Revision 1.1
2021-03-21
EVAL-M3-302F User Guide
iMOTION™ Modular Application Design Kit
Hardware description of EVAL-M3-302F
6.3.1
DC bus-sensing configuration
The low-side resistor R4 for the DC bus-sensing resistor divider on the controller board EVAL-M3-302F is 13.3 kΩ,
and should be configured in MCEWizard as shown in Figure 25. For the high-side resistor value, please refer to
the User Guide of the corresponding power board.
Figure 25
DC bus-sensing configuration in MCEWizard
6.3.2
NTC shutdown value calculation and configuration
External NTC temperature shutdown values can be calculated as shown below and configured in MCEWizard as
shown in Figure 26. For the pull-up resistor on the evaluation power board and the NTC value, please refer to
the power board’s User Guide. The value of the pull-up resistor on EVAL-M3-302F is 4.87 kΩ (see Figure 24).
𝑅
𝑡𝑜𝑡𝑎𝑙 𝑝𝑢𝑙𝑙−𝑢𝑝
=
𝑅
𝑝𝑢𝑙𝑙−𝑢𝑝 𝑜𝑛 𝐶𝑜𝑛𝑡𝑟𝑜𝑙 𝑏𝑜𝑎𝑟𝑑
∗ 𝑅
𝑝𝑢𝑙𝑙−𝑢𝑝 𝑜𝑛 𝑃𝑜𝑤𝑒𝑟 𝑏𝑜𝑎𝑟𝑑
𝑅
𝑝𝑢𝑙𝑙−𝑢𝑝 𝑜𝑛 𝐶𝑜𝑛𝑡𝑟𝑜𝑙 𝑏𝑜𝑎𝑟𝑑
+ 𝑅
𝑝𝑢𝑙𝑙−𝑢𝑝 𝑜𝑛 𝑃𝑜𝑤𝑒𝑟 𝑏𝑜𝑎𝑟𝑑
𝑉
𝑠ℎ𝑢𝑡 𝑑𝑜𝑤𝑛
=
𝑅
𝑁𝑇𝐶@𝑠𝑒𝑡𝑡𝑖𝑛𝑔 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
𝑅
𝑁𝑇𝐶@𝑠𝑒𝑡𝑡𝑖𝑛𝑔 𝑡𝑒𝑚𝑝𝑒𝑟𝑎𝑡𝑢𝑟𝑒
+ 𝑅
𝑡𝑜𝑡𝑎𝑙 𝑝𝑢𝑙𝑙−𝑢𝑝
𝑉
𝐷𝐷
For example, for EVAL-M3-CM615PN, the pull-up resistor on the power board is 9.1 kΩ. So the total pull-up
resistance calculates to be 3.172 kΩ.
