 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
AS3685A-ZDFT-2Y80 Datasheet(PDF) 16 Page - ams AG |
|
||||||||||||||||||||||||||||||
AS3685A-ZDFT-2Y80 Datasheet(HTML) 16 Page - ams AG |
|
|
16 / 25 page  AS3685A/AS3685B Datasheet www.austriamicrosystems.com/ AS3685 (ptr) Revision 2.2 15 - 24 7.2.3 AS3685A and AS3685B TXMask Function If the battery has to supply two high currents at the same time (e.g. the AS3685 flash and a RF-power amplifier) it is possible, that the total current causes a high voltage drop on the battery resulting in a shutdown of the complete system. In order to avoid this shutdown, the AS3685 (AS3685A or AS3685B) can reduce its current with the signal ‘TXMask’ using the following circuit: Figure 22 – TXMask function of the AS3685 The TXMask signal is connected to e.g. the (RF-) power amplifier enable pin (active high if the PA is enabled). This reduces the flash current if the power amplifier is enabled and avoids the unexpected shutdown of the system. Note : The internal flash timeout timer (tFLASHTIMEOUT) to limit the total flash duration, is not affected by the TXMask function (see also section ‘Flash Timeout’). The IISET current (current into the pin ISET) for TXMask = 0 can be calculated with: For TXMask = 1 the current IISET is reduced to: V(TXMask) is the actual voltage for the high level (‘1’) for the signal TXMask The maximum flash current ILEDMAX for TXMask=0 or 1 can be calculated according to the following formula using the above obtained IISET values: Choose the values for RISET and RTXMASK according to your application requirements. ISET VBAT EN1 EN2 VBAT EN1 EN2 RISET RTXMASK AS3685A AS3685B TXMask I ISET , TXMask 0 V ISET R ISET V ISET R TXMASK 1.3 V R ISET 1.3 V R TXMASK I ISET , TXMask 1 V ISET R ISET V ISET V TXMask R TXMASK 1.3 V R ISET 1.3 V V TXMask R TXMASK I LEDMAX I FLASH2BIAS IISET 7650 I ISET |
Similar Part No. - AS3685A-ZDFT-2Y80 |
|
Similar Description - AS3685A-ZDFT-2Y80 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | 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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
