M61040FP 查看數據表（PDF） - Renesas Electronics
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M61040FP Datasheet PDF : 25 Pages
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M61040FP
(3) Over current detection circuit
The over current detection circuit is shown in figure 6. This circuit is composed of comparator, reference voltage
and delay circuit.
It can be got high accuracy over current detection by adjusting detection voltage with sense resistor. Microcomputer
can detect the over current status through monitoring "CIN" pin.
Besides this block contains load-short detection circuit. This circuit detects load-short with VIN12 pin and protects
faster than over current detection.
VIN12
9
4 DFOUT
To Microcomputer
13
CIN
Delay
circuit
−
+
Vref1
VIN11
VIN10
12
11
Rsense
Battery
Figure 6 Over Current Detection Circuit
(4) Voltage regulator and reference voltage
Voltage regulator and reference circuit are shown in figure 7. Pch MOS transistor is used for output driver.
The output voltage can be adjusted by M61040 itself. So the external resistor is not required.
Note: There is a diode put between VCC and Vreg terminal to prevent the invert current from damaging this IC when
VCC voltage is higher than Vreg voltage. So please always keep Vreg voltage lower than VCC + 0.3 V.
Set a condenser on output to suppress input changes or load changes.
VREF1
−
+
VCC
1
M1
ON/OFF
VREF2
R1
−
R2
+
Vreg
20
M1
ON/OFF
R3
19
Vref
R4
Serial to Parallel conversion circuit
Figure 7 Voltage Regulator Circuit
REJ03F0237-0200 Rev.2.00 Mar 18, 2008
Page 13 of 24
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