3-Battery Version

www.DataSheet4U.com M61044FP 3-Battery Version, Reset Pin REJ03F0066-0100Z Rev.1.0 Sep.19.2003 Description The M61044FP is an semiconductor IC device developed for smart battery packs. It incorporates all the analog circuitry required by smart batteries in a single chip. When used in conjunction with a microprocessor, it allows the implementation of a variety of functions, such as battery capacity detection, through the addition of minimal peripheral devices and is ideal for smart battery system (SBS) battery packs. The M61044FP also has an on-chip overcurrent detect circuit so that the FET for controlling battery charging and discharging is protected regardless of the processing speed of the microprocessor. The microprocessor can change the amplifier gain of the charge/discharge current detect circuit, so battery capacity detection accuracy is increased. In addition, the M61044FP incorporates a linear regulator that allows it to function as the power supply for the microprocessor, thereby simplifying power supply block design. Features • • • • • • On-chip high-gain op-amp for monitoring charge and discharge current. On-chip overcurrent detect circuit to protect FET. Charge/discharge FET can be controlled from microprocessor. Power-save function for reducing current consumption. 3.3 V operation to reduce microprocessor current consumption. High-voltage device (absolute maximum rating: 33 V). Application Smart battery system (SBS) battery packs This product is currently under development, and its specifications, pin assignments, etc., are subject to change. Pin Connection Diagram (Top View) VCC RESET VIN_1 VIN_2 VIN_3 VIN_12 DFOUT CFOUT 1 2 16 VREG 15 DI M61044FP 3 4 5 6 7 8 14 CK 13 CS 12 CIN 11 Analog_out 10 VIN_11 9 GND Package: 16P-TSSOP Rev.1.0, Sep.19.2003, page 1 of 34 M61044FP Block Diagram CFOUT VCC VREG Series regulator Regulator On/off control Power-down circuit Battery voltage detect circuit Charge/discharge current detect circuit FET control circuit Overcurrent detect circuit Delay circuit DFOUT CIN VIN_12 RESET CK DI CS Serial/parallel converter circuit VIN_1 VIN_2 Gain switcher circuit Analog _OUT Output selector Shift voltage adjustor Battery 1-3 analog output VIN_3 VIN_11 GND Rev.1.0, Sep.19.2003, page 2 of 34 M61044FP Pin Function Table 1 Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Symbol Vcc RESET VIN_1 VIN_2 VIN_3 VIN_12 DFOUT CFOUT GND VIN_11 Analog_OUT CIN CS Function The chip’s power supply pin. Power is supplied by the charger or the battery. Output pin for microprocessor reset signal. Positive input pin for lithium ion battery 1. Negative input pin for lithium ion battery 1. Positive input pin for lithium ion battery 2. Negative input pin for lithium ion battery 2. Positive input pin for lithium ion battery 3. Charger connect monitor pin. Detects changes from power-down status. Output pin for discharge FET on/off signals. Also turns off when overcurrent detected. Output pin for charge FET on/off signals. Ground pin. Negative input pin for lithium ion battery 3. Connected to charge/discharge current sensor resistor. Charge/discharge current monitor pin. Connected to charge/discharge current sensor resistor. Output pin for analog signals. Capacity connection pin for setting overcurrent prevention delay time. When this pin is low level, data input is accepted and data can be stored in a 6-bit shift register. At the rising edge from low to high the value in the 6-bit shift register is latched. Shift clock input pin. At the rising edge to high the input signal from the DI pin is input to the 6-bit shift register. Shift data input pin. Serial data with a data length of 6 bits may be input via this pin. Power supply pin for microprocessor. Power can be shut off using a signal from the microprocessor. 14 15 16 CK DI Vreg Operation The M61044FP is an semiconductor IC device developed for smart battery packs. It is ideal for smart battery system (SBS) battery packs that consist of four lithium ion batteries connected in series. A high-voltage device, it is suitable for use with a wide variety of charger systems. It incorporates all the analog circuitry required by smart batteries in a single chip. When used in conjunction with a microprocessor, it allows the implementation of a variety of functions, such as battery capacity detection, through the addition of minimal peripheral devices. The functions of the M61044FP are described below. 1. Battery Voltage Detect Circuit The M61044FP can output the voltage levels of the batteries connected in series via the Analog_out pin. An on-chip buffer amplifier monitors the pin voltages of the batteries. Offset voltage correction using adjustment by the microprocessor is also supported. The M61044FP is configured to detect the battery voltage using a microprocessor driven using a power supply voltage of 5.2 V. 2. Charge/Discharge Current Detect Circuit SBS requires a function for monitoring the battery capacity. The M61044FP uses an on-chip amplifier to monitor battery capacity based on a drop in the voltage of an external sensor resistor. In this way, the charge/discharge current is converted into a voltage. The voltage amplification ratio can be adjusted from the microprocessor. In addition, the current output shift voltage can be adjusted from the microprocessor, widening the allowable dynamic range of the A/D converter. Rev.1.0, Sep.19.2003, page 3 of 34 M61044FP 3. Overcurrent Detect Circuit The M61044FP has an on-chip overcurrent detect circuit. If an excessive current flows from the lithium ion batteries, the discharge control FET is shut off after a set delay time, halting discharge. This makes the battery pack safer. The delay time can be set using an external capacitor. It is possible to determine the overcurrent detect status by monitoring the CIN pin. The overcurrent detect circuit provides protection regardless of the processing speed of the microprocessor. 4. Series Regulator The M61044FP has an on-chip low-dropout series regulator. It can be used as the power supply for the microprocessor, thereby simplifying power supply block design. VCC VREF1 + M1 Vreg ON/OFF R1 R2 From serial/parallel converter circuit Figure 3 Series Regulator 5. Reset Circuit The reset circuit of the M61041FP monitors the voltage of the Vreg pin. If the power supply voltage of the microprocessor drops the reset circuit operates, preventing microprocessor runaway. Microprocessor runaway is avoided because the microprocessor is reset if the battery pack left standing and the battery voltage is allowed to drop. This enhances the safety of battery packs that are left unused. In addition, reset circuit monitors the voltage of the Vreg pin when the battery pack is connected to the charger, ensuring that a reset will be applied if the voltage supplied to the microprocessor becomes excessively small. This helps to guarantee reliable operation. 6. Power-Save Function The M61044FP is equipped with a power-save function. When the battery voltage is being monitored a portion of the charge/discharge current monitor circuit automatically stops operating, and when the charge/discharge current is being monitored the battery voltage monitor circuit automatically stops operating. This helps prevent unnecessary power consumption. In addition, current consumption is further reduced by setting the analog output selector to ground potential output when in the standby mode. Rev.1.0, Sep.19.2003, page 4 of 34 M61044FP Transition to Power-Down Mode When the microprocessor determines that the battery voltage has dropped it sends a power-down instruction via the interface circuit. When it receives the instruction, the M61044FP’s DFOUT pin switches to high voltage. In addition, the VIN_12 pin is pulled down to low level by an internal resistor. When the VIN_12 pin goes to low potential after reception of the power-down instruction, output from the series regulator stops, switching the M61044FP into powerdown mode. At this point the operation of the circuitry is completely halted. In this status CFOUT is high level and DFOUT is high level (external charge/discharge prohibited status). The maximum current consumption of the M61044FP is 1.0 µA in order to prevent any further drop in the battery voltage. DFOUT VIN_12 VCC CFOUT Ground level after excess discharge Series regulator Control signals from interface circuit VIN_1 Vreg RESET Regulator On/off control Internal reset circuit Serial/parallel converter circuit M61044FP CK DI CS Figure 4 Operation After Excess Discharge Detection Cancellation of Power-Down Mode If the battery pack is connected to a charger when the M61044FP is in the power-down mode (VIN_12 becomes high level), the series regulator immediately begins to operate. The power-down mode is canceled, and once again the M61044FP is ready to receive instructions from the microprocessor. Absolute Maximum Ratings Table 2 Item Absolute maximum rating Power supply voltage Allowable loss Ambient operating temperature Storage temperature Symbol Vabs Vcc PD Topr Tstg Rated Value 33 30 500 -20 to +85 -40 to +125 Unit V V mW °C °C Conditions Rev.1.0, Sep.19.2003, page 5 of 34 M61044FP Standard CK TSDI DI THDI TSCS CS THCS Figure 5 Interface Block Timing Definitions Rev.1.0, Sep.19.2003, page 6 of 34 M61044FP Electrical Characteristics Table 3 (Ta = 25°C, Vcc = 14 V unless otherwise specified) Rated Value Block All Item Power supply voltage Circuit current 1 Circuit current 2 Circuit current 3 Circuit current (power-down mode) Regulator Output voltage Input stability Load stability Input voltage (VCC pin) Symbol Vsup Isup1 Isup2 Isup3 Ipd Min.  60 55 25  Typ.  150 140 80  Max. 30 215 200 115 0.5 Unit V µA µA µA µA Circuit 1 1 1 1 1 Command  1 2 3 4 During charge/discharge current monitoring During battery voltage monitoring During ground output (initial status) All circuits halted, VIN_12 = GND Vcc =