MCP3460RT-ESLASH2LX datasheet(48/103 Pages) MICROCHIP

48 / 103 page

MCP3460R

DS20006975A page 48

 2025 Microchip Technology Inc. and its subsidiaries

result in the ADCDATA register. Each end of

conversion generates a data ready interrupt on all three

IRQ mechanisms (see Section 6.8.1 “Conversion

Data Ready Interrupt”). The ADCDATA register is

never cleared when the device transitions from one

mode to another. The only way to clear the ADCDATA

(see Section 6.2.5 “Fast Commands Description”).

5.10

Low-Power Shutdown Modes

The device incorporates two low-power modes that can

be activated in order to limit power consumption of the

device when ADC is not used. These two modes are

called Partial Shutdown and Full Shutdown.

5.10.1

FULL SHUTDOWN MODE

The Full Shutdown mode can only be enabled by

sending a Fast Command Full Shutdown (Fast com-

mand code: ‘1101’). Note that the execution of this

Fast command forces the CONFIG0 to be set to 0x00

(no active block is enabled).

Full Shutdown mode is the lowest power mode of the

device. None of the circuits consuming static power are

active in this mode.

As stated in Section 5.8 “Power-On Reset”, the

AVDD/DVDD POR monitoring circuits are not active

while in Full Shutdown mode.

MCP3460R can still be accessed through the SPI

interface during this mode and will accept incoming SPI

commands. The ADCDATA register is not cleared

during Full Shutdown mode and still holds previous

conversion results. The other register settings are not

modified or reset due to entering Full Shutdown mode.

The Full Shutdown mode stops all internal timers and

resets them. Sending a Fast CMD to change the

operating mode exits the Full Shutdown mode.

The user should place all digital inputs to a static value

(logic low or high) in order to optimize power consumption

during Full Shutdown mode. The current consumption

specifications during Full Shutdown mode are intended

without any digital pin toggling during the measurement.

In this case, only leakage current is consumed throughout

the device and this current varies exponentially with

respect to absolute temperature.

5.10.2

PARTIAL SHUTDOWN MODE

Partial Shutdown mode is achieved when CONFIG0 is

set to ‘0000000x’. In this mode, most of the internal

circuits are shut down, with the exception of the POR

monitoring and internal biasing circuits. During the

Partial Shutdown mode, the power supply is

continuously monitored, whereas in Full Shutdown

mode, the POR monitoring circuits are powered down.

The power consumption is also much higher in Partial

Shutdown mode due to the POR monitoring circuits

being active. Partial Shutdown mode allows the device

to be restarted and put back in Conversion mode faster

than Full Shutdown mode. Table 5-10 describes the

differences between Partial and Full Shutdown modes.

If the current consumption of Partial Shutdown mode is

acceptable for the application, it is recommended that

it is used as an alternative to Full Shutdown mode,

where the POR monitoring circuits are shut down and

no longer monitoring the AVDD and DVDD power

supplies.

TABLE 5-9:

ADC OPERATING MODES DESCRIPTION

ADC_MODE[1:0]

ADC Mode

Description

Conversion

The ADC is placed into Conversion mode and consumes the specified current.

A/D conversions can be reset and restarted immediately once this mode is

effectively reached. This mode can be reached after a maximum of TADC_SETUP

time, depending of the current state of the ADC.

Standby

Conversions are stopped. ADC is placed into Reset but consumes almost as

much current as in Conversion mode. A/D conversions can start immediately

once this mode is effectively reached. This mode can be reached after a

maximum of TADC_SETUP time, depending of the current state of the ADC.

ADC Shutdown Conversions are stopped. ADC is placed into ADC Shutdown mode and does

not consume any current. A/D conversions can only start after TADC_SETUP

start-up time. This mode is effective immediately after being programmed.

Note:

If the digital power supply resides for a long

period of time below the POR threshold

and to a sufficiently low voltage (typically

below 0.6V), some bits previously set to ‘1’

can toggle to ‘0’ and not be set properly.

To ensure a safe operation after the Full

Shutdown mode, follow the sequence of

commands:

- Write LOCK register to 0xA5

- Write IRQ register to 0x03

- Send a Fast CMD Full Reset (1110)

- Reconfigure the chip as desired

- This sequence ensures a recovery

with the desired settings in any

loss-of-power scenario.

MCP3460RT-E/2LX Datasheet(PDF) 48 Page - Microchip Technology

MCP3460RT-E/2LX Datasheet(HTML) 48 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL