MC34844AEPR2 datasheet(13/62 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

34844

ELECTRICAL CHARACTERISTICS

STATIC AND DYNAMIC ELECTRICAL CHARACTERISTICS

MC34844

PWM GENERATOR

PWM Frequency Range (13)

M/~S = Low (Slave Mode)

fPWMS

100

25000

PWM Frequency

M/~S = High (Master Mode)

FPWM Register = 768

FPWM Register = 192,000

fPWMM

22500

25000

100

27500

110

PWM dimming resolution

tfPWM

0.39

PWM PIN (DIRECT PWM CONTROL)

Input PWM Pin Minimum Pulse(13)

tPWM_IN

150

Input PWM Frequency Range

fPWM

100

23000

PHASE LOCK LOOP

CK Slave Mode Frequency Lock Range(12)

M/~S = Low (Slave Mode)

fCKS

100

25000

CK Slave Mode Input Jitter(13)

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

CK Frequency (Master Mode)

FPWM Register = 768

FPWM Register = 192,000

fCKMASTER

22500

25000

100

27500

110

I2C/SM BUS PHYSICAL LAYER [SCK, SDA]

Interface Frequency Range

fSCK

400

kHz

SM Bus Power-on-Reset Time

tRST

100

Output fall time

ρF < CL < 400 ρF

160

Output rise time

ρF<CL<400 ρF

LOGIC OUTPUT (CK)

Output Rise and Fall time(12)

CL<100 ρF

tR/tF

LED CHANNELS

Channels Rise and Fall Time(13)

tR/tF

Notes

12.

Special considerations should be made for frequencies between 100 Hz to 1.0 KHz. Please refer to Functional Device Operation for

further details.

13.

Guaranteed by design

Table 4. Static and Dynamic 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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