MAX1403EAI+ Maxim Integrated Products, MAX1403EAI+ Datasheet - Page 32

• Manufacturer Part Number: MAX1403EAI+
• Description: IC ADC 18BIT LP 28-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1403EAI+

• Number Of Bits: 18
• Sampling Rate (per Second): 480
• Data Interface: QSPI™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 21.45mW
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Number Of Adc Inputs: 5
• Architecture: Delta-Sigma
• Conversion Rate: 4.8 KSPs
• Resolution: 18 bit
• Input Type: Voltage
• Interface Type: Serial
• Voltage Reference: External
• Supply Voltage (max): 3 V
• Maximum Power Dissipation: 21.45 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Input Signal Type: Pseudo-Differential, Differential
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 13. MAX1403 to 8051 Interface
+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
32
Listing 2. Bit-Banging SPI Replacement
______________________________________________________________________________________
/* Low-level function to write 8 bits
** The example shown here is for a bit-banging system with (CPOL=1, CPHA=1)
*/
void WriteByte (BYTE x)
{
}
/* Low-level function to read 8 bits
** The example shown here is for a bit-banging system with (CPOL=1, CPHA=1)
*/
BYTE ReadByte (void)
{
}
return x;
drive SCK pin high
count = 0;
while (cout <= 7)
{
}
x = 0;
drive SCK pin high
count = 0;
while (cout <= 7)
{
}
8051
if (bit 7 of x is 1)
else
drive SCK pin low
x = x * 2;
drive SCK pin high
count = count + 1;
x = x * 2;
drive SCK pin low
if (DOUT pin is high)
drive SCK pin high
count = count + 1;
drive DIN pin high
drive DIN pin low
x = x + 1;
P3.0
P3.1
V
DD
SCLK
CS
RESET
DOUT
DIN
MAX1403
Any microcontroller can use general-purpose I/O pins
to interface to the MAX1403. If a bidirectional or open-
drain I/O pin is available, reduce the interface pin count
by connecting DIN to DOUT (Figure 13). Listing 2
shows how to emulate the SPI in software. Use the
same initialization routine shown in Listing 1.
For best results, use a hardware interrupt to monitor the
INT pin and acquire new data as soon as it is available.
If hardware interrupts are not available, or if interrupt
latency is longer than the selected conversion rate, use
the FSYNC bit to prevent automatic measurement while
reading the data output register.
Bit-Banging Interface (80C51, PIC16C54)