MC34708 datasheet(48/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

The peak current is sensed internally for over-current protection purposes. If an over-current condition is detected the regulator

will limit the current through cycle by cycle operation and alert the system through the SW1FAULT SPI bit and issue an SCPI

interrupt via the INT pin.

SW1A/B output voltage is SPI configurable in step sizes of 12.5 mV as shown in the table below. The SPI bits SW1A[5:0] set the

output voltage for both the SW1A and SW1B.

Table 37. SW1A/B Output Voltage Programmability

Set Point SW1A[5:0]

SW1A/B

Output (V)

Set Point SW1A[5:0]

SW1A/B

Output (V)

000000

0.6500

100000

1.0500

000001

0.6625

100001

1.0625

000010

0.6750

100010

1.0750

000011

0.6875

100011

1.0875

000100

0.7000

100100

1.1000

000101

0.7125

100101

1.1125

000110

0.7250

100110

1.1250

000111

0.7375

100111

1.1375

001000

0.7500

101000

1.1500

001001

0.7625

101001

1.1625

001010

0.7750

101010

1.1750

001011

0.7875

101011

1.1875

001100

0.8000

101100

1.2000

001101

0.8125

101101

1.2125

001110

0.8250

101110

1.2250

001111

0.8375

101111

1.2375

010000

0.8500

110000

1.2500

010001

0.8625

110001

1.2625

010010

0.8750

110010

1.2750

010011

0.8875

110011

1.2875

010100

0.9000

110100

1.3000

010101

0.9125

110101

1.3125

010110

0.9250

110110

1.3250

010111

0.9375

110111

1.3375

011000

0.9500

111000

1.3500

011001

0.9625

111001

1.3625

011010

0.9750

111010

1.3750

011011

0.9875

111011

1.3875

011100

1.0000

111100

1.4000

011101

1.0125

111101

1.4125

011110

1.0250

111110

1.4250

011111

1.0375

111111

1.4375

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