AS8446

AS 8444 / AS 8446 Programmable PWM DC Motor Driver / Controller FEATURES K ey Features - - P rogrammable PWM DC Motor Driver / Controller with µP Interface (Three Wire Interface) P rogrammable Functions and Parameters for Motor Current, Voltage and Speed Regulation S ingle Voltage Supply in the range Vbat = 6.0 V to 30 V (Vbat,max = 40 V) T otal Power Efficiency up to 96 % L ow RF Emission within the whole frequency range due to an integrated special EMC compliant driver N o EMC Filters required D river fulfils EMC Level 5 (CISPR 25) D ynamically self-adjusting slew rate regulated switching technology F ully protected by programmable failure handling procedures via µP F ast Over Current and Over / Under Voltage Detection and Protection, Battery Voltage Monitoring E xternal and On Chip Temperature Detection and Protection M otor Current and Speed Measurement with a shunt resistor and capability of trimming the chip for an external shunt value L IN Bus Interface P rogrammable Parameters: • E MC compliant Driver Functions • O ver Current, Over / Under Voltage Threshold Values • M otor Failure Threshold Levels • M otor Current Measurement Range • T rimming for the current measurement shunt • P WM Frequency, Charge Pump Monitor C harge Pump to control high side drivers I ntegrated 5 V Power Supply for external components (µP, etc.) S tandby and Wake-up capability S leep / Wake-up Mode system controlled by the µ P and the LIN Bus S OIC 28 Package Bus It is an advanced PWM DC motor controller subsystem with an excellent EMC behavior targeted especially for high current automotive applications. The optimization of the EMC behavior of the entire module without external components makes it easier to implement in harsh environments. The programmability of parameters and functions allows the adaptation of the AS8444 to a wide range of applications. So the system can act either as a motor current or motor speed or motor voltage regulator. Also a full diagnosis of motor failures and power FET failures, over temperature and over/under voltage can be formed by programmable failure handling procedures using the motor characteristic and the real time measured motor current, motor speed and battery voltage. To simplify the application of this motor regulator in complex systems (e.g. automotive environment) the circuit is endowed with a LIN bus interface. There are two versions of this chip AS8444 and AS8446. The only difference between the AS8444 and the AS8446 is the start up behavior after system wake up or battery connection. Applications - F an cooler A ir conditioning F uel pumps W ater and oil pumps G eneral purpose DC Motor Regulators Typical Application Diagram Control part Power part Cbat 1 2 3 - Vbat CMN CMP VSS 28 GND_P 27 OUT Tr1 CP12 CP0 Rmeas AS8444 VMO Vbat TP FAIL CS ADC LIN n.c. 26 (optional) 4 5 Vpump 25 CP2 24 CP1 23 VDDctrl 22 VDD 21 Iref 20 RESET 19 WD 18 Rx2 17 PWM 16 CLK 15 PWMout INR CS ANA CLK GND Port1 Port2 6 7 8 9 10 µP (optional) Q1 OSC2 OSC1 VDD VDD = 5 V Rref RT1 RNTC CVDD D1 M+ General Description The AS8444 is a complete and fully protected PWM DC motor driver/controller, which could be implemented by interfacing a low cost 8-bit µ P and a high-side N-channel power FET switch. 11 Tx 12 Rx1 13 DATAin 14 DATAout M MVSS RESET Tout SPIout SPIin GND_P