PM9109BF Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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PM9109BF
South African Micro Electronic Systems
PM9109BF Datasheet PDF : 18 Pages
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PM9109BF
The formula for fP, as shown in the data sheet can be simplified if:
FOSC = 3.5795MHz recommended crystal with this frequency is used
II = 16µA
IV = 14µA
IR = 50µA
by choice of correct values for RSH, R1 and R2 (STEP 1)
by choice of correct values for R3, R6 and R4 (STEP 2)
recommended reference setting with value of 24K for
resistor R7
If these values are substituted into the original formula:
fP = 40062.5/Ks
(1)
Ks is an integer constant which can be programmed into the device.
Range is 1025 ... 16384.
Display increment frequency is 64 times lower (refer to diagram “Programmable
slope divider” in the datasheet).
Display increment = 40062.5/(Ks*64) = 626/Ks (2)
Substituting Ks into each of these two formulae gives ranges for fP and Display
increment:
fP = 39.0854Hz ... 3.6659Hz
(3)
Display increment = 0.6107Hz ... 0.0573Hz
(4)
These values are min and max for fp at all rated conditions because of properly
adjusted resistor values (chosen in STEP 1 and STEP 2) to ensure that II= 16µA
and IV = 14µA.
How much energy is now represented by one pulse on SDO?
In this example the rated power is 24000W which gives energy 24000Ws for 1
second. Energy for 1 pulse on SDO is then 24000Ws/fP. Now substitute ranges
given in statement (3) above:
Energy for 1 pulse on SDO
= (24000/39.0854)Ws ... (24000/3.6659)Ws
= 614.04Ws ... 6546.82Ws
sames
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