33984 datasheet(30/38 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33984

TYPICAL APPLICATIONS

OUTPUT CURRENT MONITORING

Figure 12 shows the CSR0 tolerance in function to 3

previous listed contributors in comparison to the minimum

and maximum specified values.

Figure 12. CSR0 Ratio Deviation in Function All

Contributors

Lower VPWR Voltage causes more error. 9.0 V

corresponding to the worst case. Figure 13 shows the CSR0

tolerance without battery variation effect.

Figure 13. CSR0 Ratio Deviation in Function

Manufacturing and Temperature

The main contributor is the manufacturing deviation, as

described in Figure 14. At 15 A of output current, the

tolerance will be about 8.5% versus 10% when all

contributors are considered.

Figure 14. CSR0 Ratio Deviation in Function

Manufacturing

PART CALIBRATION

With a calibration strategy, the part to part contribution can

be removed.

An experiment was done on low output current values

(below 5.0 A). The relative CSR0 deviation based on only

one calibration point per output (5.0 A, VPWR=16 V at 25°C)

has been performed on 3 production lots. Those parts have

tested at initial and after High Temperature Operating Life

test in order to take into account the ageing of devices.

Table 19 summaries test results covering 99.74% of parts.

Current Recopy at Vbat=9V/16V from -40°C to

125°C

16000

17000

18000

19000

20000

21000

22000

23000

24000

Output current (A)

Spec_max

Spec_min

Average (Data)

Max(Data_9V) at 6 sigmas

Min(Data_9V) at 6 sigmas

Min(Data_16V) at 6 sigmas

Max(Data_16V) at 6 sigmas

10%

Current Recopy at Vbat=9V from -40°C to 125°C

16000

17000

18000

19000

20000

21000

22000

23000

24000

Output current (A)

Table 19. CSR0 Precision for Several Output Current

Values with One Calibration Point at 5.0 A

CSR0 ratio

Min

Max

0.5 A

-25%

25%

1.0 A

-12%

12%

2.5 A

-8.0%

8.0%

5.0 A

-5.0%

5.0%

Current Recopy at Vbat=9V at 25°C

16000

17000

18000

19000

20000

21000

22000

23000

24000

Output current (A)

Spec_max

Spec_min

Average (Data)

Max(Data) at 6 sigmas

Min(Data) at 6 sigmas

8.5%

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