| ??? 08/14/08 05:08 Read: times |
#157483 - 16mA ? Responding to: ???'s previous message |
>>I changed the pull-up resistor to the micro supply
must be to connected to "controllable" supply. >> 16 mA. As i understand You have: - micro - buffer 573 (must be CMOS - HC series) consumption is microamps vs. milliampers of LS573 - SRAM - where /CS is connected? must be conttrolled, not tied to GND . If chip is disabled consumption is microamps , else - many milliamps. - ADC0804 - typically (datasheet) consumption is 2..4 milliamps. So - if You run some internal loop in Your micro( for example - toggling some free port pin), these 3 additionally chips must cinsume < 5mA. Give attention to ADC : - how clock is generated and stoped? Note that 7805 consumes too - check datasheet. Much easy is to - power all circuits from one regulator. - put all ports to "1" and disconnect GND pin (even trough NPN transistor) of external ICs, then go into IDLE mode. regards |
| Topic | Author | Date |
| I can´t shut down the others IC, why? | 01/01/70 00:00 | |
| How high impedance | 01/01/70 00:00 | |
| 5V for pull-up resistors | 01/01/70 00:00 | |
| still not cutting power | 01/01/70 00:00 | |
16mA ? | 01/01/70 00:00 | |
| Not a valid assumption? | 01/01/70 00:00 | |
| Power coupling from active ICs to 'OFF' ICs ? | 01/01/70 00:00 |