Os motores de busca de Datasheet de Componentes eletrônicos |
|
ISL12026A Folha de dados(PDF) 11 Page - Intersil Corporation |
|
ISL12026A Folha de dados(HTML) 11 Page - Intersil Corporation |
11 / 24 page 11 FN8231.9 November 30, 2010 INT Register: Interrupt Control and Frequency Output Register IM, AL1E, AL0E - Interrupt Control and Status Bits There are two Interrupt Control bits, Alarm 1 Interrupt Enable (AL1E) and Alarm 0 Interrupt Enable (AL0E) to specifically enable or disable the alarm interrupt signal output (IRQ/FOUT). The interrupts are enabled when either the AL1E or AL0E or both bits are set to ‘1’ and both the FO1 and FO0 bits are set to 0 (FOUT disabled). The IM bit enables the pulsed interrupt mode. To enter this mode, the AL0E or AL1E bits are set to “1”, and the IM bit to “1”. The IRQ/FOUT output will now be pulsed each time an alarm occurs. This means that once the interrupt mode alarm is set, it will continue to alarm for each occurring match of the alarm and present time. This mode is convenient for hourly or daily hardware interrupts in microcontroller applications such as security cameras or utility meter reading. In the case that both Alarm 0 and Alarm 1 are enabled, the IRQ/FOUT pin will be pulsed each time either alarm matches the RTC (both alarms can provide hardware interrupt). If the IM bit is also set to "1", the IRQ/FOUT will be pulsed for each of the alarms as well. FO1, FO0 - Programmable Frequency Output Bits These are two output control bits. They select one of three divisions of the internal oscillator, that is applied to the IRQ/FOUT output pin. Table 4 shows the selection bits for this output. When using this function, the Alarm output function is disabled. Oscillator Compensation Registers There are two trimming options. • ATR. Analog Trimming Register • DTR. Digital Trimming Register These registers are non-volatile. The combination of analog and digital trimming can give up to -64 to +110 ppm of total adjustment. ATR Register - ATR5, ATR4, ATR3, ATR2, ATR1, ATR0: Analog Trimming Register 6 analog trimming bits, ATR0 to ATR5, are provided in order to adjust the on-chip load capacitance value for frequency compensation of the RTC. Each bit has a different weight for capacitance adjustment. For example, using a Citizen CFS- 206 crystal with different ATR bit combinations provides an estimated ppm adjustment range from -34 to +80ppm to the nominal frequency compensation. The effective on-chip series load capacitance, CLOAD, ranges from 4.5pF to 20.25pF with a mid-scale value of 12.5pF (default). CLOAD is changed via two digitally controlled capacitors, CX1 and CX2, connected from the X1 and X2 pins to ground (see Figure 8). The value of CX1 and CX2 is given by Equation 1: The effective series load capacitance is the combination of CX1 and CX2: For example, CLOAD(ATR = 00000) = 12.5pF, CLOAD (ATR = 100000) = 4.5pF, and CLOAD(ATR = 011111) = 20.25pF. The entire range for the series combination of load capacitance goes from 4.5pF to 20.25pF in 0.25pF steps. Note that these are typical values. TABLE 3. PROTECTED ADDRESSES ISL12026 ARRAY LOCK 0 0 0 None (Default) None 0 0 1 180h – 1FFh Upper 1/4 0 1 0 100h – 1FFh Upper 1/2 0 1 1 000h – 1FFh Full Array 10 0 000h – 03Fh First 4 Pages 10 1 000h – 07Fh First 8 Pages 1 1 0 000h – 0FFh First 16 Pages 1 1 1 000h – 1FFh Full Array TABLE 4. PROGRAMMABLE FREQUENCY OUTPUT BITS FO1 FO0 OUTPUT FREQUENCY 0 0 Alarm output (FOUT disabled) 0 1 32.768kHz 1 0 4096Hz 11 1Hz FIGURE 8. DIAGRAM OF ATR CX1 X1 X2 CRYSTAL OSCILLATOR CX2 C X 16 b5 ⋅ 8b4 4 b3 2b2 1 b1 0.5b0 9 + ⋅ + ⋅ + ⋅ + ⋅ + ⋅ + ()pF = (EQ. 1) C LOAD 1 1 C X1 ----------- 1 C X2 ----------- + ⎝⎠ ⎛⎞ ----------------------------------- = C LOAD 16 b5 ⋅ 8 b4 4 b3 2 b2 1 b1 0.5 b0 9 + ⋅ + ⋅ + ⋅ + ⋅ + ⋅ + 2 ----------------------------------------------------------------------------------------------------------------------------- ⎝⎠ ⎛⎞ pF = (EQ. 2) ISL12026, ISL12026A |
Nº de peça semelhante - ISL12026A |
|
Descrição semelhante - ISL12026A |
|
|
Ligação URL |
Privacy Policy |
ALLDATASHEETPT.COM |
ALLDATASHEET é útil para você? [ DONATE ] |
Sobre Alldatasheet | Publicidade | Contato conosco | Privacy Policy | roca de Link | Lista de Fabricantes 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 |