 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
EM78P372KSS20 Datasheet(PDF) 65 Page - ELAN Microelectronics Corp |
|
|
|||||||||||||||||||||||||||||
EM78P372KSS20 Datasheet(HTML) 65 Page - ELAN Microelectronics Corp |
|
|
65 / 118 page  EM78P372K 8-bit Microcontroller Product Specification (V1.4) 05.11.2016 57 (This specification is subject to change without prior notice) 7.7.3 ADC Sampling Time The accuracy, linearity, and speed of the successive approximation of the AD converter are dependent on the properties of the ADC and the comparator. The source impedance and the internal sampling impedance directly affect the time required to charge the sample holding capacitor. The application program controls the length of the sample time to meet the specified accuracy. Generally speaking, the program should wait for 2 s for each K of the analog source impedance and at least 2s for the low-impedance source. The maximum recommended impedance for analog source is 10K at Vdd=5V. After the analog input channel is selected, this acquisition time must be done before the conversion is started. 7.7.4 AD Conversion Time CKR1 and CKR0 select the conversion time (Tct), in terms of instruction cycles. This allows the MCU to run at the maximum frequency without sacrificing the AD conversion accuracy. For the EM78P372K, the conversion time per bit is about 1 s. The table below shows the relationship between Tct and the maximum operating frequencies. TAD = 1µs CPUS CKR1 : CKR0 Operation Mode Max. Operation Frequency Max. Conversion Rate/Bit Max. Conversion Rate 1 00 (default) FOSC/16 16 MHz 1 MHz (1µs) 16*1µs=16µs (62.5kHz) 1 01 FOSC/4 4 MHz 1 MHz (1µs) 16*1µs=16µs (62.5kHz) 1 10 FOSC/64 - - - 1 11 FOSC/1 1 MHz 1 MHz (1µs) 16*1µs=16µs (62.5kHz) 0 16K/128kHz TAD = 4µs CPUS CKR1 : CKR0 Operation Mode Max. Operation Frequency Max. Conversion Rate/Bit Max. Conversion Rate 1 00 (default) FOSC/16 4 MHz 250kHz (4µs) 16*4µs=64µs (15.625kHz) 1 01 FOSC/4 1 MHz 250kHz (4µs) 16*4µs=64µs (15.625kHz) 1 10 FOSC/64 16 MHz 250kHz (4µs) 16*4µs=64µs (15.625kHz) 1 11 FOSC/1 - - - 0 16K/128kHz NOTE ■ Pin not used as an analog input pin can be used as regular input or output pin. ■ During conversion, do not perform output instruction to maintain precision for all of the pins. |
|
Link URL |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link to Datasheet | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
New Zealand ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
