XE8805AMI028LF Semtech, XE8805AMI028LF Datasheet - Page 94

• Manufacturer Part Number: XE8805AMI028LF
• Description: IC DAS 16BIT FLASH 8K MTP 64LQFP
• Manufacturer: Semtech

Specifications of XE8805AMI028LF

• Applications: Sensing Machine
• Core Processor: RISC
• Program Memory Type: FLASH (22 kB)
• Controller Series: XE8000
• Ram Size: 512 x 8
• Interface: UART, USRT
• Number Of I /o: 24
• Voltage - Supply: 2.4 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Supply Voltage Range: 2.4V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 64
• For Use With: XE8000MP - PROG BOARD AND PROSTART2 CARD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

16.4.3
The ADC can be operated in two distinct modes: "continuous-time" and "on-request" modes (selected using the bit
CONT).
In "continuous-time" mode, the input signal is repeatedly converted into digital. After a conversion is finished, a new
one is automatically initiated. The new value is then written in the result register, and the corresponding internal
trigger pulse is generated. This operation is sketched in Figure 16-3. The conversion time in this case is defined as
T
In the "on-request" mode, the internal behaviour of the converter is the same as in the "continuous-time" mode, but
the conversion is initiated on user request (with the START bit). As shown in Figure 16-4, the conversion time is
also T
on a lower frequency clock than the CPU, there might be a small delay (max. 1 cycle of the ADC sampling
frequency) between the writing of the START or CONT bits and the appearance of BUSY flag.
© Semtech 2006
CONV
.
CONV
. Note that the flag is set at the effective start of the conversion. Since the ADC is generally synchronized
Continuous-Time vs. On-Request
RegACOut[15:0]
RegACOut[15:0]
Figure 16-3. ADC "continuous-time" operation
Internal Trig
Ouput Code
Internal Trig
Ouput Code
Figure 16-4. ADC "on-request" operation
Request
START
BUSY
BUSY
IRQ
IRQ
16-8
T
T
CONV
CONV
XE8805/05A
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