Zakładka z wyszukiwarką danych komponentów |
|
SI1120 Arkusz danych(PDF) 7 Page - Silicon Laboratories |
|
SI1120 Arkusz danych(HTML) 7 Page - Silicon Laboratories |
7 / 20 page Si1120 Rev. 1.0 7 2.2. Mode Selection The Si1120 features a shutdown mode, three proximity-detection modes, three ambient-light sensing modes, and an offset calibration for high-sensitivity mode. Mode selection is accomplished through the sequencing of the SC (shutdown/clock), MD (mode), and STX (strobe/transmit) pins. The part enters shutdown mode unconditionally when SC is high. Each of the MD and STX inputs should be set to a valid high or low state. In shutdown mode, the PRX output is tri-stated, and the power-supply and TXO output leakage currents are negligible. The active modes are set by clocking the state of MD and STX on the falling edge of SC and then setting MD to the required state. Since setting SC high forces shutdown, SC must be held low for the selected mode to remain active. The timing diagram in Figure 2 illustrates the programming sequence. Table 4 indicates the various mode encodings. After the correct state has been programmed, the STX input is used to trigger measurements. Figure 2. Si1120 Mode Programming Timing Diagram If the mode must be changed, the SC pin may need to be rearmed (set high), in which case the shutdown mode is set and a power-on latency of about 500 µs is incurred upon enabling of the selected mode when SC goes back low. Following a mode change, STX must be kept low during the power-up latency period. If the host sets STX too early, the Si1120 may not begin a measurement cycle; PRX does not assert. If this occurs, the host can restart a measurement by toggling STX. Table 4. Mode Control Table Mode Description STX (Latch) MD (Latch) MD (Static) PRX400 Proximity, 400 mA LED current (Mode 0) 0 0 0 OFC Offset calibration for high sensitivity (Mode 1) 0 0 1 PRX50 Proximity, 50 mA LED current (Mode 2) 0 1 0 PRX50H Proximity, 50 mA LED current, high reflectance (Mode 3) 0 1 1 VIRL Visible and infrared ambient, low range (Mode 4) 1 0 0 VAMB Visible ambient (Mode 5) 1 0 1 VIRH Visible and infrared ambient, high range (Mode 6) 1 1 0 (Reserved) Reserved mode 1 1 1 |
Podobny numer części - SI1120 |
|
Podobny opis - SI1120 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |