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Número de pieza | M61048FP | |
Descripción | Battery Protection Analog Front End (AFE) IC | |
Fabricantes | Renesas Technology | |
Logotipo | ||
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M61048FP
Battery Protection Analog Front End (AFE) IC
REJ03F0129-0100
Rev.1.00
Mar 04, 2005
Description
The M61048FP is intended to be used as SB: Smart Battery. All functions needed for SB are packed to this M61048FP.
The combination use with microcomputer such as M37512 will give various functions such as a detection of SB
Remaining Capacity. The reset circuit and the linear regulator for Vcc/Vref of microcomputer are dedicated in
M61048FP. So this will help easy design of power circuit design of SB.
Features
• All FETs are controlled by microcomputer
• Built-in low dropout series regulator for microcomputer
• Built-in battery voltage monitor circuit of each battery cell
• Built-in output selector, which outputs the voltage each selected battery cell
• Built-in discharge circuit of each battery cell
• Built-in voltage detection circuit of each battery cell
• Built-in FET OFF function controlled by microcomputer
• Various powers saving function to reduce total power dissipation
• 3-wire serial data transfer system for communication from microcomputer
• High Input Voltage Device (Absolute Maximum Rating: 33 V)
• CMOS monolithic IC
Application
• Smart Battery System
Block Diagram
VCC
VIN12
CFET PCFET DFET
VREG
DFETCNT
CFETCNT
RESET
CS
CK
DI
ANALOG
Series
regulator
Reset circuit
Serial to Parallel
conversion circuit
Multiplexer
circuit
FET control circuit
Battery cell
voltage
detection
circuit
Battery cell
1-4 voltage
analog output
VIN1
VIN2
VIN3
VIN4
GND
Rev.1.00 Mar 04, 2005 page 1 of 23
1 page M61048FP
Measurement Circuit
Measuring Ipd: OFF
Except above: ON
Ipd, Ips, Isup
A
CFET
VCC
VIN1
VIN2
VIN3
VIN4
GND
PCFET
DFET
VIN12
VREG
DI
CK
CS
ANALOG
Measuring Ipd: ON
Except above: OFF
0.47µF
Data input
0.5V↔VREG–0.5V
Measurement circuit 1
CFET
VCC
VIN1
VIN2
VIN3
VIN4
GND
PCFET
DFET
VIN12
VREG
DI
CK
CS
ANALOG
Measurement circuit 2
I (VREG)
0.47µF V
Data input
0.5V↔VREG–0.5V
Rev.1.00 Mar 04, 2005 page 5 of 23
5 Page M61048FP
Block Diagram Description
Battery Voltage Detection Circuit
The M61048FP battery voltage detection circuit is shown in Figure 3. This circuit is composed of switch, buffer
amplifier, reference voltage section and logic circuit.
Microcomputer selects detecting voltage before logic circuit controls the connection of switches. This connection
decides which cell voltage (Vbat1, Vbat2, Vbat3, Vbat4) should be output from Analog out pin. Besides offset voltage
can be output.
In Power Down mode, supply current in this block is close to zero because all switches are off.
Note: Regard 100 µs as the standard of settling time by voltage change in this block.
S11 VIN1
Switch control
From Serial to Parallel
conversion circuit
Logic circuit
To Multiplexer circuit
–
+
VREF
S22
VIN2
S21
S32
VIN3
S31
S42
VIN4
S41
S02
GND
S01
Figure 3 Battery Voltage Detection Circuit
VBAT1
VBAT2
VBAT3
VBAT4
Table 1 Turned on Switches
VBAT1_OUTPUT
VBAT2_OUTPUT
VBAT3_OUTPUT
VBAT4_OUTPUT
VBAT1_OFFSET
VBAT2_OFFSET
VBAT3_OFFSET
VBAT4_OFFSET
Function
Turn on Switch (refer to Figure 3)
S11, S22
S21, S32
S31, S42
S41, S02
S21, S22
S31, S32
S41, S42
S01, S02
Rev.1.00 Mar 04, 2005 page 11 of 23
11 Page |
Páginas | Total 24 Páginas | |
PDF Descargar | [ Datasheet M61048FP.PDF ] |
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