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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SDA датащи(PDF) 25 Page - Exar Corporation |
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SDA датащи(HTML) 25 Page - Exar Corporation |
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25 / 29 page  X XR RP P7 77 72 24 4 Q Qu ua ad d C Ch ha an nn ne ell D Diig giitta all P PW WM M/ /P PF FM M P Prro og grra am mm ma ab blle e P Po ow we err M Ma an na ag ge em me en ntt S Sy ys stte em m © 2012 Exar Corporation 25/29 Rev. 1.0.1 Group 0 – is controlled by the chip ENABLE or I2C command. Channels assigned to this group will come up with the ENABLE signal being high, and will go down with the ENABLE signal being low. The control can always be overridden with an I2C command. Since it is recommended to leave the ENABLE pin floating in the applications when Vcc = LDO5 = 4.75V to 5.5V, please contact Exar for how to configure the channels to come up at the power up in this scenario. Group 1 – can be controlled by any GPIO/PSIO or I2C command. Channels assigned to this group will start-up or shut-down following transitions of a signal applied to the GPIO/PSIO set to control the group. The control can always be overridden with an I2C command. Group 2 – can be controlled by any GPIO/PSIO or I2C command. Channels assigned to this group will start-up or shut-down following transitions of a signal applied to the GPIO/PSIO set to control the group. The control can always be overridden with an I2C command. Start-up For each channel within a group a user can specify the following start-up characteristics: Ramp Rate – expressed in milliseconds per Volt. It does not apply to LDO3.3. Order – order position of a channel to come-up within the group Wait PGOOD? – selecting this option for a channel means the next channel in the order cannot start ramping-up until this channel reaches the target level and its Power Good flag gets asserted. Delay – an additional time delay a user can specify to postpone a channel start-up with respect to the previous channel in the order. The delay is expressed in milliseconds with a range of 0msec to 255msec. Shut-down For each channel within a group a user can specify the following shut-down characteristics: Ramp Rate – expressed in milliseconds per Volt. It does not apply to LDO3.3. Order – order position of a channel to come-down within the group Wait Stop Thresh? – selecting this option for a channel means the next channel in the order cannot start ramping- down until this channel reaches the Stop Threshold level. The stop threshold level is fixed at 600mV. Delay – additional time delay a user can specify to postpone a channel shut-down with respect to the previous channel in the order. The delay is expressed in milliseconds with a range of 0msec to 255msec. MONITORING VCC AND TEMPERATURE Through I2C commands, the host can read back voltage applied to the Vcc pin and the die temperature respectively. The Vcc read back resolution is 200mV per LSB; the die temperature read back resolution is 5C° per LSB. For more on I2C commands please refer to ANP-38 “XRP7724 Command Set and Programming Guide”. PROGRAMMING XRP7724 XRP7724 is a FLASH based device which means its configuration can be programmed into FLASH NVM and re-programmed a number of times. Programming of FLASH NVM is done through PA5. |
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