SS6782G Charge Controller for Dual Batteries FEATURES DESCRIPTION Quick and easy testing for production. Sequential charging control of two NiMH/NiCd Battery Packs. Reliable sequential fast charge control of dual NiMH and/or NiCd Battery Packs, even with a fluctuating charging current. Fast charge termination by: ∆T∆t, -∆V, 0∆V, safety timer, maximum temperature, or maximum voltage. Linearly adjustable safety timer and ∆T∆t detection slope line. Selectable battery voltage protection range. Selectable battery temperature protection mode. Protection against battery voltage and battery temperature faults. Selectable LED display mode for battery status. Five pulsed trickle charge modes. Discharge-before-charge function available to eliminate memory effect. Choice of 20-pin DIP or 20-pin SOP packages. The SS6782G fast-charge controller is designed for intelligent sequential charging of dual NiMH and NiCd batteries without the risk of malfunction. After powering on, the SS6782G charging sequence gives priority to battery pack A, represented by input signals at the ATS and ABV pins, over battery pack B, represented by BTS and BBV pin signals. The SS6782G automatically switches to charging the standby battery pack after the battery pack being charged finishes charging or encounters a fault condition. -∆ V (-0.25%) detection, 0∆V (peak voltage timer) detection, and ∆T∆t detection are the primary methods employed by the SS6782G to terminate fast charge. The fast charge can also be cut off by maximum battery voltage and maximum battery temperature detection along with the safety timer to prevent charging under fault conditions of the charging system or the battery APPLICATIONS itself. Dual-Battery Fast Chargers for: Mobile Phones. Notebook and Laptop Personal Computers. Portable Power Tools and Toys. Portable Communication Equipments. Portable Video & Stereo Equipments. 1.55 100 Cell Voltage 1.35 60 1.25 40 Temperature 1.15 0 10 20 40 50 60 Battery charging characteristics from an SS6782G-controlled charger with a fluctuating charging current. 9/21/2005 Rev.3.01 NiMH and NiCd batteries. The SS6782G utilizes the combination of these two methods to make a reliable decision for ending fast charge and to avoid issues caused by using -∆V detection example of a charging curve of a battery charged by a fluctuating current from a NiMH battery charger which uses the SS6782G controller IC to achieve optimal charging. The ∆T∆t or -∆V detection circuitry may be disabled independently for different applications, such as system-integrated chargers, 30 Charge Time (min.) Fig. 1 proved powerful in terminating fast charging for alone under certain conditions. Fig. 1 shows an 80 1.45 Temperature (°C) Cell Voltage (V) Charge Current = 600mA Cell Capacity = 550mA NiMH Battery Both ∆T∆t and -∆V detection methods have been 20 chargers with varying charge current, or battery packs lacking a temperature-sensing thermistor. www.SiliconStandard.com 1 of 19 SS6782G The safety timer period, the mode of battery reduce the memory effect of NiCd batteries without temperature protection, battery voltage protection the risk of overdischarging. A test mode is provided range, the pulsed trickle charge duty cycle, and the for charger manufacturers to dramatically reduce the LED display mode are all adjustable or selectable. production test time. A discharge-before-charge function is included to TYPICAL APPLICATION CIRCUIT R1 R3 100K R2 + R27 4.7K 1N4148 R28 R34 VIN 0.1/2W C11 220µF R22 470 BOOST FB VIN + 78L05 C9 100µF R33 47K A1012 Q4 SS6563G 1N5820 D5 R25 1N4148 D3 R35 1.5K 470 Q5 3904 R26 330 B2 D8 1N4148 + 2.2µF C12 1M R36 3 680 B C5 0.1µF R11 + VCC(5V) 5 C7 0.1µF C6 100µF R12 6 R13 VCC(5V) 7 R14 8 R24 2.7K 100K B1 A C8 0.1µF VCC(5V) R16 R15 BBV 19 LEB2 18 R20 LED4 680 SS6782G R32 R10 20 SW1 2 Q7 D468 DSW ICOB VCC 5V 4 D2 1N4148 THERMISTOR GND Q1 D468 THERMISTOR VCC C10 R5 20/5W R21 2.7K BATTERY B CF IS R23 330 ABV LED5 R37 3.9K VCC(5V) Q3 3904 VCC(5V) R4 390 BATTERY A DE 1nF 200µH + D1 1N5821 1 C4 0.1µF 4.7µF 1N5820 A1012 D4 Q2 RS L1 C3 R7 + 1N4148 1K A1012 Q6 R29 R30 150 220 DC 4.7K R8 100K R6 D7 C2 0.1µF C1 4.7µF D6 DIS LEB1 17 R19 LED3 680 GND 16 BTS VCC SEL1 15 ADJ SEL2 SEL3 TMR 14 13 MODE 9 ATS ICOA R17 10 LEA1 680 LEA2 12 11 R18 LED2 680 LED1 Battery charger for Dual NiMH and NiCd Batteries 9/21/2005 Rev.3.01 www.SiliconStandard.com 2 of 19 SS6782G ORDERING INFORMATION PIN CONFIGURATION SS6782GXXX PIN CONFIGURATION Packing options TR: tape and reel (not for PDIP) TB: tube (only option for PDIP) Package type GN: RoHS-compliant PDIP-20 GS: RoHS-compliant SO-20 Example: SS6782GSTR in RoHS-compliant SO-20, shipped on tape and reel TOP VIEW ABV 1 20 DSW BBV 2 19 ICOB DIS 3 18 LEB2 BTS 4 17 LEB1 VCC 5 16 GND ADJ 6 15 SEL1 SEL3 7 14 SEL2 TMR 8 13 MODE 9 12 ICOA LEA1 10 11 LEA2 ATS ABSOLUTE MAXIMUM RATINGS Supply voltage 5.5V DC voltage applied on any pin 5.5V Sink current of ICOA pin, LEA1 and LEA2 pins 20mA Sink current of ICOB pin, LEB1 and LEB2 pins 20mA Operating temperature range -40°C ~ +85°C Maximum junction temperature 125°C Storage temperature range -65°C~ 150°C Lead temperature (soldering 10 sec.) ………………………………………………… 260°C Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. 9/21/2005 Rev.3.01 www.SiliconStandard.com 3 of 19 SS6782G TEST CIRCUIT Voltage Source - + ABV DSW BBV ICOB DIS LEB2 Voltage Source - + YELLOW R1 + Voltage Source VCC (5V) VCC V1 (0.95V) BTS LEB1 VCC GND 100K GREEN R4 RED R5 560 ADJ V2 (3V) 560 560 560 - ORANGE R3 SS6782G VCC SEL1 SEL3 SEL2 TMR MODE ATS ICOA LEA1 LEA2 VCC VCC R2 - + Voltage Source RED VCC R6 ORANGE R8 560 GREEN R7 560 560 ELECTRICAL CHARACTERISTICS (TA=25°C, VCC=5V, unless otherwise specified) (Note1) PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT Supply Voltage VCC 4.5 5 5.5 V Supply Current ICC Battery Low Before Initial Timer After Initial Timer (SEL3>3V) Voltage Protection Limit Temperature Sense Limit 9/21/2005 Rev.3.01 1.1 mA 0.11 0.16 0.21 0.63 0.69 0.75 1.1 1.2 1.3 Battery High (SEL3>3V) 2.6 2.7 2.8 (SEL3<2V) 1.9 2.0 2.1 1.35 1.45 1.55 3.5 3.6 3.7 (SEL3<2V) Temperature High Temperature Low VABV VBBV VATS VBTS www.SiliconStandard.com V V 4 of 19 SS6782G ELECTRICAL CHARACTERISTICS (Continued) PARAMETER TEST CONDITIONS Output Impedance of DIS pin Output Impedance SYMBOL ZDIS ON Recommended External Resistor on TMR pin MAX. UNIT 140 250 Ω 25 50 Ω SEL3 pin DSW pin 1 ISEL3 IDSW MODE, SEL1, SEL2 pins Input Impedance TYP. LEA1, LEA2, LEB1, LEB2, ICOA, ICOB pins OFF Source Current Capability MIN. ABV, BBV, ATS, BTS, ADJ pins MΩ 5.5 16 µA µA 300 kΩ 1 RTMR −∆V detection level relative to peak value 2 MΩ 100 -0.25 1000 kΩ % Note 1: Specifications are production-tested at TA=25°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). 9/21/2005 Rev.3.01 www.SiliconStandard.com 5 of 19 SS6782G TYPICAL PERFORMANCE CHARACTERISTICS (TA=25°C, R2=100kΩ , VCC=5V, refer to the test circuit, page 4) 1.18 Safety Timer (min.) Supply Current (mA) 81.0 1.12 1.06 80.5 80.0 79.5 1.00 79.0 4.4 4.6 4.8 5.0 5.2 5.4 4.6 4.8 5.0 5.2 5.4 VCC (V) VCC (V) Supply Current vs. Supply Voltage Fig. 2 Fig. 3 Safety Timer vs. Supply Voltage 1.26 Supply Current (mA) 82.0 Safety Timer (min.) 4.4 81.0 80.0 1.14 1.02 0.90 79.0 0 20 Fig. 4 40 60 0 80 20 Temperature(°C) Safety Timer vs. Temperature Fig. 5 2.74 40 Temperature (°C) 60 80 Supply Current vs. Temperature 2.03 ABV, BBV (V) ABV, BBV (V) 2.02 2.70 2.66 2.62 0 20 Fig. 6 9/21/2005 Rev.3.01 40 60 Temperature (°C) ABV and BBV (High) Limit vs. Temperature (SEL3>3V) 80 2.00 1.98 0 20 Fig. 7 www.SiliconStandard.com 40 60 80 Temperature (°C) ABV and BBV (High) Limit vs. Temperature (SEL3<2V) 6 of 19 SS6782G TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 29 0.163 Output Impedance(Ω) ABV, BBV (V) 0.162 0.160 0.158 27 25 23 0 20 Fig. 8 40 60 80 0 Temperature (°C) ABV and BBV (Low) Limit vs. Temperature (Before Initial Timer) 20 40 60 80 Temperature(°C) Output Impedance vs. Temperature (LEA’s, LEB’s, ICO’s pins) Fig. 9 0.710 1.22 ABV, BBV (V) ABV, BBV (V) 0.705 1.21 0.700 0.695 1.20 1.19 20 0 Fig. 10 40 60 80 0.690 0 Temperature (°C) ABV and BBV (Low) limits vs. Temperature (SEL3<2V, After Initial Timer) 20 Fig. 11 40 60 80 Temperature (°C) ABV and BBV (Low) limits vs. Temperature (SEL3>3V, After Initial Timer) 1.48 3.61 ATS, BTS (V) ATS, BTS (V) 3.62 3.60 1.46 1.44 3.59 3.58 0 20 Fig. 12 9/21/2005 Rev.3.01 40 60 Temperature (°C) ATS and BTS (High) Limit vs. Temperature 80 1.42 0 20 Fig. 13 www.SiliconStandard.com 40 60 80 Temperature (°C) ATS and BTS (Low) Limit vs. Temperature 7 of 19 SS6782G BLOCK DIAGRAM GND VCC MODE SEL3 SEL1 SEL2 ADJ Bandgap Reference & Voltage Regulator MODE Selection Battery Voltage & Temperature Protection Setting LED Display& Trickle Charge Duty Setting TMR LEB2 LEB1 LEA2 Oscillator Timing Control Unit LEA1 Display Control Unit Charge Control State Machine Charge Control Unit ∆T/∆t Detection Setting Battery Temperature Protection ICOB ICOA DIS 13-bit A/D Discharge Control Unit Battery Voltage Protection + DSW CHARGE END ATS BTS ABV BBV PIN DESCRIPTIONS PIN 1: ABV - Battery voltage input to sense the voltage of battery pack A. PIN 5: VCC - Power supply 5V±10%. PIN 6: ADJ - For adjusting the slope of ∆T/∆t. Acceptable voltage range for this pin is approximately 0.28V to 3.8V. If the voltage is higher than (VCC - 0.3V), then ∆ T/∆ t detection is disabled. PIN 7: SEL3 - Determines the acceptable voltage range of ABV and BBV pins and the mode of the temperature protection function. PIN 8: TMR - Determines the period of the safety timer with an external resistor connected to GND. PIN 2: BBV - Battery voltage input to sense the voltage of battery pack B. PIN 3: DIS - Push-pull output, used to control an external transistor to discharge the battery pack B. DIS is active high when the discharge function is enabled. PIN 4: BTS - The battery cell temperature of pack B is represented as a voltage input to the SS6782G on this pin. The acceptable voltage range of the BTS pin is 0.29Vcc to 0.72Vcc. 9/21/2005 Rev.3.01 www.SiliconStandard.com input at 8 of 19 SS6782G PIN 9: ATS PIN 10: LEA1 PIN 11: LEA2 PIN 12: ICOA PIN 15: SEL1 - Tri-level inputs, which jointly control the LED display mode and the duty of trickle charge after the completion of fast charge. - The same as pin 14. - Open-draind outputs used to indicate the charging status of the battery pack A. - The same as pin 10. PIN 16: GND - Power ground. PIN 17: LEB1 - Open-drain output, used to control the charging current of the battery pack A. PIN 18: LEB2 - Open-drain outputs used to indicate the charging status of battery pack B - The same as pin 17. - The battery cell temperature of pack A is represented as a voltage input to the SS6782G on this pin. The acceptable voltage range of the ATS pin is 0.29Vcc to 0.72Vcc. PIN 14: SEL2 PIN 19: ICOB - Open-drain output, used to control the charging current of the battery pack B. PIN 20: DSW - Controls the function of discharge-before-charge of the battery pack B. (See discharge-before-charge subsection in the application information section). PIN 13: MODE - Determines the operating mode of the SS6782G. APPLICATION INFORMATION OPERATION Power-on and Battery Pre-qualification The SS6782G is a sequential charger, initiating charging on either battery pack A or B. When power is first applied to the SS6782G, all internal digital circuits of the SS6782G are reset by the internal power-on-reset circuitry, and the output of LED‘s (depending on the setting of SEL1 and SEL2 pins) flash 3 times to indicate the initiation of power-on. If both battery pack A and B are present when V CC is applied to the SS6782G, the charging action begins with battery pack A if conditions are acceptable. pack B is examined through the BTS and BBV pins. The acceptable limits of ABV and BBV are determined by the input voltage of SEL3 pin and the acceptable temperature sense voltage window for ATS and BTS of 0.29Vcc to 0.72Vcc. The SS6782G controls initiation of the charging action and checks for acceptable battery voltage and temperature prior to fast charging. If the voltage of ABV or BBV does not fall within the predetermined acceptable limits, the corresponding battery pack enters a chargingsuspended mode. If the voltage of ATS or BTS is outside the 0.29VCC to 0.72VCC window, the The condition of battery pack A is examined through the ATS and ABV pins, while battery 9/21/2005 Rev.3.01 www.SiliconStandard.com 9 of 19 SS6782G action to be taken is determined by the input voltage of SEL3 pin. timer period, even deeply discharged batteries can easily qualify to be fast charged subsequently. Discharge-Before-Charge The SS6782G provides the function of dischargebefore-charge to precondition NiCd batteries, which can suffer from a memory effect. This function can only be activated for pack B after the prequalification of battery voltage and temperature, but before the charge completion is registered for a fast charge cycle of pack B. To trigger this function, DSW pin has to be biased to GND over 0.18 second. After discharge begins, LEB1 and LEB2 pins are both OFF, ICOB pin is ON, and DIS pin goes high to activate an external circuit to discharge the battery pack B until the voltage of BBV pin fall below 0.9V (or 0.69V, depending on the input voltage of SEL3 pin) or DSW pin is biased to GND for over 0.18 second again. The application circuit is included in the TYPICAL APPLICATION CIRCUIT shown on page 2. Fast Charge After the battery passes fault checks, charging begins on either of the batteries, and the other battery remains in a waiting state until the first battery terminates fast charging. The SS6782G automatically switches to fast charge the second battery. The battery pack A has the priority over battery pack B only when power is first applied to the SS6782G. When fast charging begins, the initial and safety timer of the SS6782G start counting. The -∆V detection, peak voltage timer, ∆T / ∆ t detection, and maximum battery voltage functions are, however, disabled temporarily until the initial timer period in the initial stage of the charging cycle elapses. The initial timer period is equal to 1/80 of safety timer. Since the low limit of acceptable ABV or BBV voltages are only about 0.16V during the initial 9/21/2005 Rev.3.01 In the course of fast charge, the SS6782G constantly monitors the battery voltage and temperature through ABV (or BBV) and ATS (or BTS) pins. The fast charge process is registered complete when any one of the following situations is encountered, which are explained below: Negative delta voltage (-∆V). Peak voltage timer ( 0 ∆V ). Delta temperature/ delta time ( ∆T / ∆t ). Maximum charge time. Maximum battery voltage. Maximum battery temperature. -∆ V Cutoff The SS6782G makes a voltage sampling at ABV (or BBV) pin every 4 seconds when the safety timer period is set equal to 80 minutes. If a negative delta voltage of 0.25% compared to its peak value is detected at ABV (or BBV) pin, the fast charge cycle is terminated. 0∆ V Cutoff If the battery voltage stays at its peak value or decreases very slowly for the duration determined by the peak voltage timer, which is in turn equal to 3.7% of the safety timer, the fast charging action is terminated. ∆ T/∆ t Cutoff The ∆T / ∆t detection of the SS6782G is performed by sensing the decrease of ATS (or BTS) pin voltage in a specific timer interval dictated by the safety timer. The fast charging terminates when the decrease of ATS (or BTS) pin voltage in 56 seconds exceeds the predetermined value set by ADJ pin input. This time interval of 56 seconds is based on the assumption that the voltage of ATS (or BTS) pin is sampled www.SiliconStandard.com 10 of 19 SS6782G once every 8 seconds, which is also determined by the safety timer. DESIGN GUIDE ABV/BBV Range and Temperature Protection The -∆V detection and peak voltage timer (0∆ V) functions can be disabled if the MODE pin is biased to GND. The ∆ T/ ∆ t function can be disabled if the voltage of the ADJ pin is higher than (Vcc-0.3V). The acceptable battery voltage range of ABV and BBV pins and the mode of temperature protection function is determined by the voltage of the SEL3 pin, shown as the following: Maximum Safety Timer Cutoff (a) SEL3 > VCC - 0.3V Acceptable ABV/BBV Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V The maximum fast charge period is determined by the safety timer, which is set by a resistor connected from TMR pin to GND. Safety timer, -∆V sampling rate, and ∆T / ∆t sampling rate will be longer if the resistor value is larger. When the value of the resistor is 100kΩ, the safety timer period equals 80 minutes. This can be verified by biasing the MODE pin to VCC and the measured frequency on DSW pin should be around 32.8 KHz. After the safety timer period is finished, the fast charge action is terminated. Temperature Protection Mode: Enters charging-suspended mode when temperature is either too low or too high, same as abnormal battery voltage. Latch for chargesuspending function is provided for high temperature protection, but not for low temperature protection. V cc - 0.4V 2 (b) VCC - 1.4V> SEL3 > Acceptable ABV/BBV Range: Before initial timer: 0.16V~2.7V After initial timer: 0.69V~2.7V Maximum Voltage and Temperature Cutoff The SS6782G guards against the maximum limits for battery voltage and temperature during fast charging. If either of these limits is exceeded, fast charge action is terminated. Temperature Protection Mode: If temperature is too high, battery charging is regarded as completed. If temperature is too low, function of ∆T / ∆t detection is disabled, just as if the thermistor did not exist. Trickle Charge There are five different selectable duty cycles for trickle charging after fast charging to prevent the loss of charge due to battery selfdischarging. The setting of SEL1 and SEL2 pins controls the duty cycle. This function can only be activated in the following three situations: Battery pack A is fully charged and battery pack B is abnormal. Battery pack B is fully charged and battery pack A is abnormal. Battery pack A and B are both fully charged. 9/21/2005 Rev.3.01 (c) V cc - 0.4V>SEL3 >1.4V 2 Acceptable ABV/BBV Range: Before initial timer: 0.16V~2 V After initial timer: 1.2V~2V Temperature Protection Mode: Enters the charging-suspended mode when temperature is too low or too high, same as abnormal battery voltage. Latch for charging-suspended function is provided for high temperature protection, but not for low temperature protection. www.SiliconStandard.com 11 of 19 SS6782G (d) 0.3V> SEL3 Acceptable ABV/BBV Range: Before initial timer: 0.16V~2 V After initial timer:1.2V~2V RA/RB RA kΩ RB kΩ 2~4 2 240 120 Temperature Protection Mode: 3~6 3.3 300 91 If temperature is too high, battery charging is regarded as complete. If temperature is too low, the ∆ t/ ∆ t detection function is disabled, just as if the thermistor did not exist. 4~8 4.9 300 62 5~10 6.4 300 47 Battery Voltage Measurement The SS6782G measures the battery voltage through ABV and BBV pins, which are connected to the battery positive terminals through a resistordivider network, as shown in Fig. 14. The acceptable limit of divided battery voltage is determined by the input voltage of SEL3 pin. VBAT TABLE 1 BATTERY CELLS RA R6 C6 0.1µF + C5 4.7µF RB ABV/BBV 100K SS6782G 6~12 7.8 310 39 8~16 10.8 390 36 For SEL3 < ((VCC/2) -0.4V), the suggested divider resistances of RA and RB for the corresponding number of battery cells are shown below: TABLE 2 BATTERY CELLS RA/RB RA (kΩ ) RB (kΩ ) 2 1 240 240 3 2 240 120 4 3 240 80 5 4 300 75 6 5 300 60 8 7 360 51 10 9 360 40 12 11 390 36 16 15 410 27 Fig. 14 Battery Voltage Divider For SEL3 > ((VCC/2) + 0.4V), the suggested divider resistances of RA and RB for the corresponding number of battery cells are as below: 9/21/2005 Rev.3.01 Battery Temperature Measurement The SS6782G employs a negative temperature coefficient (NTC) thermistor to measure the bat’ tery s temperature. The thermistor is inherently nonlinear with respect to temperature. To reduce the effect of nonlinearity, a resistor-divider network in parallel with the thermistor is recommended. A typical application circuit is shown in Fig. 15. www.SiliconStandard.com 12 of 19 SS6782G VCC VBAT 5 VCC ATS/BTS 0.1µF Thermistor Rx C7 Ry//RTH × Vcc Rx + (Ry// RTL) RTL= The resistance of thermistor at lower limit of temperature protection. 0.72 Vcc = SS6782G Ry 16 GND Fig. 15 Battery Temperature Sense Circuit with a Negative Temperature-Coefficient (NTC) Thermistor The calculation for Rx and Ry in the circuit is as follows: Ry / /RTH 0.29 Vcc = × Vcc Rx + (Ry / / RTH) RTH= The resistance of thermistor at upper limit of temperature protection. TABLE 3 Values of Rx and Ry at TL = 0°C Substitution and rearranging the equations yields RTL × RTH Rx= 2.061 × RTL − RTH 5.3 × RTL × RTH Ry = RTL − 6.3RTH If the temperature characteristic of the thermistor is like that of the SEMITEC 103AT-2, the resistance of Rx and Ry is tabulated below for different values of TL and TH: (note: TL is the lower temperature limit and TH is the upper temperature limit.) TABLE 4 Values of Rx and Ry at TL = -10°C TH (°C) 50 51 52 53 54 55 56 Rx(kΩ) 10.1 9.7 9.4 9.0 8.7 8.4 Ry (kΩ) 551.1 300.7 204.8 153.9 122.8 101.8 TH (°C) Rx (kΩ) Ry (kΩ) 45 11.4 95.6 46 11.0 85.0 47 10.6 76.2 48 10.2 68.9 49 9.8 62.8 8.1 86.5 50 9.5 57.5 57 7.8 75.0 51 9.1 52.9 58 7.5 66.0 52 8.8 48.8 59 7.2 58.7 53 8.5 45.3 60 7.0 52.8 54 8.2 42.1 61 6.8 47.8 55 7.9 39.4 62 6.5 43.6 56 7.6 36.8 63 6.3 39.9 57 7.4 34.6 64 6.1 36.8 58 7.1 32.5 65 5.9 34.0 59 6.9 30.7 66 5.7 31.6 60 6.7 29.0 67 5.5 29.5 61 6.4 27.4 68 5.3 27.5 62 6.2 26.0 69 5.2 25.8 63 6.0 24.6 70 5.0 24.3 64 5.8 23.4 65 5.6 22.2 9/21/2005 Rev.3.01 www.SiliconStandard.com 13 of 19 SS6782G Setting the ADJ Pin Voltage ∆ T / ∆t = The slope of ∆T / ∆t detection is determined by the ADJ pin voltage of the SS6782G. 1 = 0. 0166 60 (d) VADJ =25 x 0.043 x 0.0166 x 56 = 1(V) If the temperature range is from 0°C to 50°C, the voltage of VADJ under different setting conditions should be set as tabulated below. The calculation of ADJ pin voltage is shown in the following procedure followed by an example. Procedure TABLE 5 ADJ Pin Voltage (TL=0°C, TH=50°C) (a) First, determine the temperature protection limits TH and TL. Then, substitute TH & TL into the following equation: ∆V TS 0.72V CC − 0.29V CC 0.43V CC = = ∆TBASE TH − TL TH − TL ∆T / ∆t S.T. 40 min. (2C) 80 min. (1C) 120 min. (0.67C) (b) Determine the safety timer to obtain the value of ∆tBASE . 56(sec.) ∆tBASE(sec.) = × Safety Timer (min .) 80(min .) (c) Determine the expected slope of ∆T / ∆t at which temperature rises y°C in x seconds and fast charge is subsequently cut off. ∆T y = ∆t x (d) Calculate the value of VADJ ∆T ∆V TS V ADJ = 25 × × × ∆t BASE ∆TBASE ∆t Example (a) Let TH=50°C, TL=0°C, VCC =5V. We have ∆VTS 0.43 × 5 = = 0.043V/ °C ∆TBASE 50 − 0 which means that VTS decreases 43mV as temperature rises 1°C. (b) If safety timer is equal to 80 minutes, ∆tBASE is then 56 seconds. (c) If fast charging should be terminated when temperature rises 1°C in 60 seconds, then 9/21/2005 Rev.3.01 160 min. (0.5C) 200 min. (0.4C) 240 min. (0.33C) 0.75 1.0 1.25 (°C/min.) (°C/min.) (°C/min.) 0.37 0.5 0.63 0.75 1.0 1.25 1.12 1.5 1.87 1.5 2.0 2.5 1.87 2.5 3.12 2.25 3.0 3.75 A similar table for temperature range from 0°C to 60°C is shown below. TABLE 6 ADJ Pin Voltage (TL=0°C, TH=60°C) ∆T / ∆t S.T. 0.75 1.0 1.25 (°C/min.) (°C/min.) (°C/min.) 40 min. (2C) 0.31 0.42 0.52 80 min. (1C) 0.62 0.84 1.05 120 min. (0.67C) 0.94 1.25 1.56 160 min. (0.5C) 1.25 1.67 2.08 200 min. (0.4C) 1.56 2.08 2.60 240 min. (0.33C) 1.87 2.5 3.12 Setting the Period of Safety Timer The SS6782G provides a method for linearly adjusting the period of safety timer with an external resistor connected from TMR pin to GND. The relation between safety timer length and the external resistor (RTMR) is shown in Fig. 16. The table following shows the resistor values. www.SiliconStandard.com 14 of 19 SS6782G for some of the commonly chosen safety timer For relevant information, please contact SSC di- periods. Also shown in the table is their corre- rectly. sponding oscillator frequencies. TABLE 8 The Operating Mode of SS6782G 800 MODE pin Mode Function VCC Test Safety timer period scaled down to 1/32.... etc. Floating Normal Normal operation GND AC RTMR (kΩ) 600 400 -∆ V detection disabled 200 The LED Display and Trickle Charge Modes 0 0 100 200 300 400 500 Safety Timer (min.) Fig. 16 Safety Timer vs RTMR TABLE 7 RTMR (kΩ) 11 23 48 74 100 152 206 314 491 667 The SS6782G provides two LED display modes and five pulsed trickle charge modes. The modes of LED display and trickle charge are determined by the tri-level inputs, SEL1 and Osc.Freq. (kHz) 262.4 131.2 65.6 43.7 32.8 21.9 16.4 10.9 7.3 5.5 Safety timer (min.) 10 20 40 60 80 120 160 240 360 480 SEL2 pins, as in the TABLE 9. TABLE 9 Mode of LED Display and Trickle Charge SEL2 Trickle Charge Duty LED Display Mode VCC VCC Floating GND N/A 1/32 1/64 Type 1 Type 1 Type 1 Floating VCC Floating GND 1/128 1/256 N/A Type 1 Type 1 Type 2 GND VCC Floating GND 1/32 1/64 1/128 Type 2 Type 2 Type 2 SEL1 Selecting Mode of Operation The SS6782G provides three modes of operation: normal, test, and AC mode, determined by the setting of the MODE pin according to TABLE 8. The SS6782G will operate normally when the MODE pin is left floating (a 0.1µF capacitor is Displaying the Battery Charging Status recommended to be tied to the MODE pin if the The SS6782G provides four open-drain outputs, in which LEA1 and LEA2 are used to indicate the battery charging status of pack A, and LEB1 and LEB2 are used to indicate battery charging status of pack B. Refering to the table of LED display modes (TABLE 6), depending on the setting of SEL1 and SEL2 pins, the outputs of LEA1, LEA2, LEB1, and LEB2 pins are shown in the following table: charging circuit works in a noisy environment). When the MODE pin is biased to GND, the function of −∆V detection is disabled. When the MODE pin is biased to VCC, the SS6782G enters the test mode. The test mode can be used to significantly reduce production test time. 9/21/2005 Rev.3.01 www.SiliconStandard.com 15 of 19 SS6782G TYPE 1 Test Mode Power On Wait Charge Full Abnormal LEA1/ LEB1 1HZ ON ON OFF OFF LEA2/ LEB2 OFF ON OFF ON OFF Power On Wait Charge Full Abnormal LEA1/ LEB1 1HZ 1HZ ON OFF 4HZ LEA2/ LEB2 1HZ 1HZ 4HZ ON OFF TYPE 2 Fig. 17 shows the timing diagram for externally controlled ADJ, ABV, BBV, ATS, BTS, SEL1 and SEL2 pin voltages in a recommended SS6782G test scheme, utilizing TEST mode function. Output waveforms of LEA1, LEA2, LEB1, LEB2, ICOA and ICOB from a properly functioning SS6782G are also shown in the figure. For detailed information please consult with SSC staff directly. Charging Current Control As shown in the typical application circuit, the SS6782G offers two open-drain output pins, ICOA and ICOB pins, to control the charging current of battery pack A and pack B. When fast charging is completed, the SS6782G enters the trickle charge mode. In trickle charge mode, the ICOA or ICOB output pins switch with predetermined duty cycle. Refering to the table of trickle charge mode (TABLE 6), the duty cycle is determined by the setting of SEL1 and SEL2 pins. The following table summarizes how ICOA and ICOB pins correspond to various charging states. Power Wait Fast Charge Fault ON ON Charging Completed Conditions ICOA/ ON ICOB 9/21/2005 Rev.3.01 ON OFF See pin 14 & 15 ON www.SiliconStandard.com 16 of 19 SS6782G TIMING DIAGRAM VCC, SEL3, MODE=5V, (DSW FREQ.=820KHz, 25 TIMES of 32.8K) Power Init. PEAK TIMER TEST ON -∆V TEST ∆T/∆t TEST -∆V DISABLE TEST 5V ADJ SAFETY TIMER TEST 1.12V 3V <2.1V (-0.15%) 1.95V 2V (A):ABV (B):BBV 2V (-0.15%) 1.997V 1.997V 2V 1.997V 1.9V 1.5V (A):ATS (B):BTS 2V 1.993V (-0.35%) 4V 4V 4V 2V 2V 1.96V 6.01 ON Floating Floating 0.14 0.12 1 0.74 2 0.1 0.14 0.12 11 12 6.11 6.25 6.37 0.26 0.12 3 4 1 0.74 1.26 1.38 0.32 1.17 0.12 5 6 0.32 GND Floating 0.97 0.5 0.24 7 2.02 2.14 0.26 Delay 0.3 13 14 7.21 7.47 ON Floating GND 0.32 2.46 ON OFF OFF VCC Floating 0 0.14 0.26 TIME (B) (SEC.) STAGE 3.2KHz ON OFF SEL1 SEL2 ON ON ON (A):ICOA (B):ICOB OFF OFF OFF (A):LEA2 (B):LEB2 2V 2mV Step/100mS (-2.5%) OFF ON (A):LEA1 (B):LEB1 0.1 1.85V (-2.15%) OFF 4V <2.1V 2V 0V TIME (A) (SEC.) STAGE 2mV Step/100mS 3.43 GND GND 0.4 1.32 8 9 3.93 4.17 0.5 0.24 15 7.77 4.57 Floating Floating 0.1 0.02 10 5.89 5.99 6.01 0.4 16 8.27 8.51 8.91 Fig. 17 Timing Diagram of SS6782G in Test Mode 9/21/2005 Rev.3.01 www.SiliconStandard.com 17 of 19 SS6782G PHYSICAL DIMENSIONS (unit: mm) DIP-20 D E1 S Y M B O L A A2 A b2 E L A1 D1 MAX. MIN. A 5.33 A1 A DIP-20 MILLIMETERS e 0.38 A2 2.92 4.95 b 0.36 0.56 b2 1.14 1.78 c 0.20 0.35 D 24.89 26.92 D1 0.13 E 7.62 E1 6.10 8.26 7.11 e 2.54 BSC eA 7.62 BSC eB L 0.38 GAUGE PLANE 10.92 3.81 2.92 b c WITH PLATING BASE METAL eA eB SECTION A-A SOP-20 (300 mil) D A h x 45° E e H S Y M B O L A SEE VIEW B SOP-20 MILLIMETERS MIN. 2.35 2.65 A1 0.10 0.30 B 0.33 0.51 C 0.23 0.32 D 12.60 13.00 E 7.40 A1 A e B MAX. A 7.60 1.27 BSC H 10.00 h 0.25 0.50 L 0.40 1.27 0° 8° θ 10.65 0.25 C WITH PLATING BASE METAL SECTION A-A L VIEW B 9/21/2005 Rev.3.01 θ GAUGE PLANE SEATING PLANE www.SiliconStandard.com 18 of 19 SS6782G Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of Silicon Standard Corporation or any third parties. 9/21/2005 Rev.3.01 www.SiliconStandard.com 19 of 19