Rainbow-electronics MAX1386 Manual do Utilizador descarregar pdf (Página 28)

MAX1385/MAX1386

Dual RF LDMOS Bias Controllers

with I

C/SPI Interface

28 ______________________________________________________________________________________

IH1 and IH2 (Read/Write)

Write to Channel 1 and Channel 2 High-Current-

Threshold registers by sending the appropriate write

command byte followed by data bits D15–D0 (see

Table 5). Bits D15–D12 are don’t care. Read channel 1

and channel 2 high-current thresholds by sending the

appropriate read command byte. Channel 1 and

Channel 2 Current-Threshold registers are compared to

ADC readings at PGAOUT1 and PGAOUT2. Use the

following equation to find the required threshold code

for a specified threshold current:

where I

DRAIN

is the current threshold in amperes,

SENSE

is the sense resistor, Av

PGA

is the voltage gain

of the PGA, V

REFADC

is the ADC reference voltage, and

THRESH

is the resulting threshold register value

in decimal.

IL1 and IL2 (Read/Write)

Write to Channel 1 and Channel 2 Low-Current-

Threshold registers by sending the appropriate write

command byte followed by data bits D15–D0 (see

Table 6). Bits D15–D12 are don’t care. Read channel 1

and channel 2 low-current thresholds by sending the

appropriate read command byte. Channel 1 and

Channel 2 Low-Current Threshold registers are com-

pared to ADC readings at PGAOUT1 and PGAOUT2.

IIRAv

THRESH DRAIN SENSE PGA

REFADC

=× × ×

4096

FLAG REGISTER

READ

FLAG REGISTER

READ

TIME

MEASUREMENT VALUE

(TEMPERATURE OR CURRENT)

HIGH THRESHOLD

LOW THRESHOLD

ALARM OUTPUT

OUTPUT-

COMPARATOR MODE

(ACTIVE LOW)

OUTPUT-

INTERRUPT MODE

(ACTIVE LOW)

Figure 10. Hysteresis-Threshold-Mode Timing Diagram

D15 D14 D13 D12

D11

(MSB)

D10 D9 D8 D7 D6 D5 D4 D3 D2 D1

(LSB)

POR XXXX0 111111111 1 1

Bit Value

(°C)

X X X X -256 +128 +64 +32 +16 +8 +4 +2 +1 +0.5 +0.25 +0.125

Table 3. TH1 and TH2 (Read/Write)

X = Don’t care.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 51 52

MAX1385/MAX1386 1
C/SPI Interface 1

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