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MB3771 数据表(PDF) 8 Page - Cypress Semiconductor |
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MB3771 数据表(HTML) 8 Page - Cypress Semiconductor |
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8 / 24 page ![]() MB3771 Document Number: 002-08511 Rev. *A Page 8 of 24 8. Application Circuit 8.1 5V Power Supply Monitor Monitored by VSA. Detection threshold voltage is VSAL and VSAH 8.2 5V Power Supply Voltage Monitor (Externally Fine-Tuned Type) The VSA detection voltage can be adjusted externally. Resistance R1 and R2 are set sufficiently lower than the IC internal partial voltage resistance, so that the detection voltage can be set using the ratio between resistance R1 and R2. (Refer to the table below). ■ R1, R2 calculation formula (when R1 << 100 k, R2 <<40 k) VSAL := (R1 + R2 ) VSB /R2 [V], VSAH := (R1 + R2 ) (VSB + VHYSB) / R2 [V] R1 (k)R2 (k) Detection voltage : VSAL (V) Detection voltage : VSAH (V) 10 3.9 4.37 4.47 9.1 3.9 4.11 4.20 VCC CT RESET MB3771 1 2 3 4 8 7 6 5 Logic circuit VCC CT RESET MB3771 1 2 3 4 8 7 6 5 R1 R2 Logic Circuit |
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