AD5100EVAL datasheet(19/32 Pages) AD

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Preliminary Technical Data

AD5100

Rev. PrJ | Page 19 of 32

Power Requirements

Internal Power

The AD5100 internal power VREG is derived from V1MON and

V2MON is used to turn AD5100 on and off with a different

behavior depending on the V2MON monitoring mode

selection. By default, in the V2MON level sensitive mode, the

AD5100 turns on when the voltage at V2MON rises above the

logic threshold V2MON_ON, When V2MON falls below the logic

threshold V2MON_OFF, AD5100 will trun off 2 seconds after

SHDN

is deasserted. Note that AD5100 requries 5 us to start

up and that V1MON must be applied before V2MON. The extension

of the AD5100 turn-off attempts to allow the system to

complete any housekeeping tasks before the system is

powered off. Figure 17 shows the defaulted V2MON and VREG

waveforms.

2MON

2.2V

GLITCH

VREG_On_Delay

6V < V

1MON < 30V

* Programmable

VREG_Off_Delay

REG

2SD_HOLD *

SHDN

2MON_ON *

2MON_OFF *

2SD_HOLD *

2SD_DELAY *

VREG_Off_Delay

2MON_OFF *

2MON_ON *

2SD_DELAY *

2MON

2.2V

GLITCH

VREG_On_Delay

6V < V

1MON < 30V

* Programmable

VREG_Off_Delay

REG

2SD_HOLD *

SHDN

2MON_ON *

2MON_OFF *

2SD_HOLD *

2SD_DELAY *

VREG_Off_Delay

2MON_OFF *

2MON_ON *

2SD_DELAY *

Figure 17. Internal Power VREG versus V2MON Timing Diagrams (Default)

If the Pulse-Sensitive V2MON Mode is selected instead, the

AD5100 will not turn off when V2MON returns to a logic low.

In this mode, once the part has been powered on, it can only

be power-down by an I2C power down instruction or by

eliminating the supply on V1MON pin. This feature is for the

applications that use a wake up signal.

VOTP

A 6V supply voltage is needed only during OTP fuse

programming. This voltage should be provided by an

external source during factory programming and should have

6V/200mA driving capability. The OTP programming

duration depends on the numbers of programming fuses

with maximum duration of 10ms. VOTP is not required for

normal operation. The VOTP has dual functions, it is used for

programming the non-volatile memory fuse arrays as well as

serving as a compensation network for internal power

stability. As a result, a bypass capacitor must be connected at

VOTP pin at all times. A low ESR 10uF tantalum capacitor is

recommended.

Figure 18. Power Supply Requirement

AD5100 achieves the OTP function through blowing internal

fuses. Users should always apply the 6 V one-time program

voltage requirement at the first fuse programming attempt.

Failure to comply with this requirement may lead to a change in

the fuse structures, rendering programming inoperable.

Care should be taken when SCL and SDA are driven from a low

voltage logic driver.

AD5100

V1MON

6V - 30V

VOTP

APPLY FOR OTP ONLY

μF

V2MON

3V - 30V

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