Battery Protection Analog Front End (AFE) IC

www.DataSheet4U.com M61047FP Battery Protection Analog Front End (AFE) IC REJ03F0005-0200 Rev.2.00 Mar 04, 2005 Description The M61047FP is intended to be used as SB: Smart Battery. All functions needed for SB are packed to this M61047FP. The combination use with microcomputer such as M37517 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 M61047FP. 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 Series regulator FET control circuit DFETCNT CFETCNT RESET Reset circuit Battery cell voltage detection circuit VIN1 VIN2 VIN3 VIN4 GND Battery cell 1-4 voltage analog output CS CK DI Serial to Parallel conversion circuit ANALOG Multiplexer circuit Rev.2.00 Mar 04, 2005 page 1 of 23 M61047FP Pin Arrangement CK DI ANALOG CFET DFET PCFET GND VREG VCC DFETCNT 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 CS CFETCNT VIN1 VIN2 VIN3 VIN4 RESET VIN12 N.C. N.C. (Top view) Package: PLSP0020JB-A (20P2F-A) M61047FP Pin Description Pin No. 9 8 13 18 17 16 15 7 5 4 6 14 3 19 10 20 1 2 Pin Name VCC VREG VIN12 VIN1 VIN2 VIN3 VIN4 GND DFET CFET PCFET RESET ANALOG CFETCNT DFETCNT CS CK DI Function Power source pin. Power from charger or battery Linear-Regulator output for microcomputer Monitoring charger is connected or not Battery 1 + voltage input Battery 1 – voltage and Battery 2 + voltage input Battery 2 – voltage and Battery 3 + voltage input Battery 3 – voltage and Battery 4 + voltage input Ground and Battery 4 - voltage input Discharge FET-Drive Output. The Driver is turned off by Microcomputer Charge FET-Drive Output. The Driver is turned off by Microcomputer Pre-charge FET-Drive Output. The Driver is turned off by Microcomputer Reset signal output to RESET of Microcomputer Various Analog signal outputs to AD-input of Microcomputer Input of CFET and PCFET control signal from Microcomputer Input of DFET control signal from Microcomputer During low signal input to this CS, data input to DI is enabled Input of shift clock from Microcomputer. DI's input data is latched by low-to-high edge of this CK Input of 6-bit length serial data from Microcomputer Rev.2.00 Mar 04, 2005 page 2 of 23 M61047FP Absolute Maximum Ratings Item Absolute maximum rating Supply voltage Power dissipation Operating temperature range Storage temperature range Symbol Vabs Vcc PD Topr1 Tstg Ratings 33 30 800 –20 to +85 –40 to +125 Unit V V mW °C °C Condition Reference period CK TSDI DI THDI TSCS CS THCS Figure 1 Interface Timing Rev.2.00 Mar 04, 2005 page 3 of 23 M61047FP Electrical Characteristics (Ta = 25°C, Vcc = 14 V, unless otherwise noted) Block Total Item Supply voltage Supply current 1 Supply current 2 Supply current 3 Regulator Output voltage Linear regulation Symbol Vsup Isup Ips Ipd Vreg ∆Vline Min. — 35 20 — 3.276 4.75 — — Load regulation ∆Vload — — Reset Battery voltage detection Detection voltage Release voltage Input offset voltage Voltage gain Output source current Output sink current Detection voltage of battery cell Interface DI input H voltage DI input L voltage CS input H voltage CS input L voltage CK input H voltage CK input L voltage DI set-up time DI hold time CS set-up time CS hold time DFETCNT input H voltage DFETCNT input L voltage CFETCNT input H voltage CFETCNT input L voltage CFETCNT sink current Conditioning circuit VIN1 resistor VIN2 resistor VIN3 resistor VIN4 resistor Vdet– Vdet+ Voff Gamp Isource Isink Vmo_max VDIH VDIL VCSH VCSL VCKH VCKL TSDI THDI TSCS THCS VDCH VDCL VCCH VCCL ICCH RON1 RON2 RON3 RON4 2.6 2.9 31 0.594 75 150 4.7 Vreg–0.5 0 Vreg–0.5 0 Vreg–0.5 0 600 600 600 600 Vreg–0.5 0 Vreg–0.5 0 0.3 250 250 250 250 Typ. — 75 45 — 3.3 5.0 2 4 3 5 2.75 2.975 206 0.600 — — — — — — — — — — — — — — — — — 1 500 500 500 500 Max. 30 115 70 0.5 3.333 5.25 10 100 15 150 2.9 3.05 385 0.606 — — — Vreg 0.5 Vreg 0.5 Vreg 0.5 — — — — Vreg 0.5 Vreg 0.5 2 1000 1000 1000 1000 Unit V µA µA µA V V mV mV mV mV V V mV — µA µA V V V V V V V ns ns ns ns V V V V µA Ω Ω Ω Ω Circuit 1 1 1 1 2 2 2 2 2 2 3 3 4 4 5 5 2, 4 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 7 7 7 7 CFETCNT = 3.3V (Vreg–Voff1)/Gamp VREG = 3.3V Power save mode (Battery voltage detection: OFF) Power down mode VCC = 14V, Iout = 10mA VCC = 14V, Iout = 10mA VREG = 3.3V VCC = 6.0V to 24V, Iout = 10mA VREG = 5.0V VCC = 7.5V to 24V, Iout = 10mA VREG = 3.3V VCC = 6.0V, Iout = 50µA to 10mA VREG = 5.0V VCC = 7.5V, Iout = 50µA to 50mA VREG = 3.3V VREG = 3.3V Condition Rev.2.00 Mar 04, 2005 page 4 of 23 M61047FP Measurement Circuit Measuring Ipd: OFF Except above: ON Ipd, Ips, Isup A VCC CFET PCFET DFET VIN12 VREG Measuring Ipd: ON Except above: OFF VIN1 VIN2 VIN3 VIN4 0.47µF DI CK CS Data input 0.5V↔VREG–0.5V GND ANALOG Measurement circuit 1 CFET VCC VIN1 VIN2 VIN3 VIN4 PCFET DFET VIN12 I (VREG) VREG 0.47µF V DI CK CS Data input 0.5V↔VREG–0.5V GND ANALOG Measurement circuit 2 Rev.2.00 Mar 04, 2005 page 5 of 23 M61047FP CFET VCC VIN1 VIN2 VIN3 VIN4 PCFET DFET VIN12 VREG V RESET DI CK CS Data input 0.5V↔VREG–0.5V GND ANALOG Measurement circuit 3 CFET VCC VIN1 V1 VIN2 V2 VIN3 V3 VIN4 V4 GND PCFET DFET VIN12 VREG 0.47µF DI CK CS ANALOG V Data input 0.5V↔VREG–0.5V Measurement circuit 4 Rev.2.00 Mar 04, 2005 page 6 of 23 M61047FP CFET VCC VIN1 V1 VIN2 V2 VIN3 V3 VIN4 V4 GND PCFET DFET VIN12 VREG 0.47µF DI CK CS Isink ANALOG A Isource Data input 0.5V↔VREG–0.5V Measurement circuit 5 CFET VCC 14V VIN1 VIN2 VIN3 VIN4 CFETCNT DFETCNT A A GND PCFET DFET VIN12 VREG 3.3V DI CK CS A ANALOG A A Measurement circuit 6 Rev.2.00 Mar 04, 2005 page 7 of 23 M61047FP CFET VCC A V1 A V2 A V3 A V4 GND VIN4 VIN3 VIN2 VIN1 PCFET DFET VIN12 VREG 0.47µF DI CK CS ANALOG Data input 0.5V↔VREG–0.5V Measurement circuit 7 Rev.2.00 Mar 04, 2005 page 8 of 23 M61047FP Operation Description M61047FP is developed for intelligent Li-ion battery pack such as SB in SBS. M61047FP is suitable for Smart Battery. Pair using with Microcomputer such as M37517 and small additional parts will give various functions such as battery remaining capacity detection. All functions are described as follows. Note: SBS: Smart Battery System introduced by Intel and Duracell SB: Smart Battery, which contains 3 or 4 series Li-ion battery cells. Voltage Detection Circuit of Each Li-ion Battery Cell M61047FP can output each battery cell's voltage of 3 or 4 series connection. Built-in buffer amplifier is monitoring each battery voltage. Series Regulator M61047FP contains low drop out series regulator. Microcomputer in SB does not need any additional voltage regulator. Usually, although series regulator is 3.3 V output, it is possible to change to 5 V output by register setup at the time of flash memory rewriting of microcomputer. Reset Circuit Vreg output voltage is checked by Reset circuit of M61047FP. Therefore, lower voltage of Vreg issues RESET signal to stop mull-function of microcomputer. Also, lower voltage after long time's left issues RESET signal to stop mullfunction of microcomputer. This function is useful for safety of long time's left battery. When charger is connected to SB, this circuit will check Vreg voltage, so if Vreg voltage is NOT enough high, this circuit remains low as for RESET signal to microcomputer. Conditioning Circuit M61047FP have a discharge circuit of each cells. It is available for drop of cell voltage for safety purpose. And to shorten the difference voltage among the cells. It can extend the battery pack life. Power Save Function M61047FP contains power save function to control several supply current. It can operate in the three state, usual mode, power save mode, and power down mode. These three modes can be changed by the command from a microcomputer, and can control the consumption current in each mode. 1. Usual mode It is in the state where all circuits are operating. 2. Power save mode In power save mode, consumption current is reduced by stopping voltage detection circuit, and outputting ALALOG output with GND level. If ANALOG output is changed to the battery voltage output or offset voltage output of each cell by the command from a microcomputer, it will change to usual mode. In addition, the regulator circuit is operating in a power save mode. 3. Power down mode In power down mode, all circuits will be stopped. The shift to power down mode and operation at the time of resume from power down mode are explained below using Figure 2. Rev.2.00 Mar 04, 2005 page 9 of 23 M61047FP • Enter Power Down Mode Microcomputer issues power down command to M61047FP after microcomputer detects that battery voltage is too low. After this command, the DFET pin is set to 'high' and the VIN12 pin is pulled down by internal resistor to be set 'low' and series regulator are turned off. In the power down mode, the M61047FP operation is impossible. And CFET, DFET and PCFET are set to 'high'. (In this situation, discharging is forbidden.) At this time, supply current becomes max. 0.5 µA, so drops of battery voltage is prevented. • Resume from Power Down Mode