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MC34844 Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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MC34844 Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
10 / 37 page Analog Integrated Circuit Device Data 10 Freescale Semiconductor 34844 ELECTRICAL CHARACTERISTICS PWM GENERATOR PWM Frequency Range (12) M/~S = Low (Slave Mode) fPWMS 100 - 25000 Hz PWM Frequency M/~S = High (Master Mode) FPWM Register = 768 FPWM Register = 192,000 fPWMM 22500 90 25000 100 27500 110 Hz PWM dimming resolution tfPWM - 0.39 - % PWM PIN (DIRECT PWM CONTROL) Input PWM Pin Minimum Pulse(12) tPWM_IN 150 - - ns Input PWM Frequency Range fPWM 100 - 23000 Hz PHASE LOCK LOOP CK Slave Mode Frequency Lock Range(11) M/~S = Low (Slave Mode) fCKS 100 - 25000 Hz CK Slave Mode Input Jitter(12) M/~S = Low (Slave Mode) fCKS_JITTER - - 0.1 % Slave Mode Acquisition Time M/~S = Low (Slave Mode) FPWMS=25 kHz FPWMS=100 Hz TS_ACQ - - - 2000 50 - ms ms CK Frequency (Master Mode) FPWM Register = 768 FPWM Register = 192,000 fCKMASTER 22500 90 25000 100 27500 110 Hz I2C/SM BUS PHYSICAL LAYER [SCK, SDA] Interface Frequency Range fSCK 400 kHz SM Bus Power-on-Reset Time tRST - - 100 ms Output fall time 10 ρF < CL < 400 ρF tF 40 - 160 ns Output rise time 10 ρF<CL<400 ρF tR 20 - 80 ns LOGIC OUTPUT (CK) Output Rise and Fall time(11) CL<100 ρF tR/tF - - 25 ns LED CHANNELS Channels Rise and Fall Time(12) tR/tF - 23 50 ns Notes 11. Special considerations should be made for frequencies between 100 Hz to 1.0 KHz. Please refer to Functional Device Operation for further details. 12. Guaranteed by design Table 3. Electrical Characteristics (continued) Characteristics noted under conditions VIN = 12 V, VOUT = 42 V, ILED = 50 mA, PWM = VDC1, M/~S = VDC1, PIN & NIN = VDC1, -40 °C ≤ TA ≤ 105°C, PGND = 0 V, unless otherwise noted. Characteristic Symbol Min Typ Max Unit |
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