DA9211 datasheet(35/74 Pages) DIALOG

35 / 74 page

DA9211 and DA9212

Datasheet

Company confidential

Data sheet

Version <3.0>

<07-Jan-2015>

CFR0011-120-00 Rev 3

35 of 74

Table 12: Selection of the buck current limit from the coil parameters

Min ISAT (mA)

Frequency (MHz)

Buck current limit (mA)

Average current (mA)

5060

4600

3300

4180

3800

2700

3080

2800

2000

1760

1600

1100

Ports Description

13.2

This section describes the functionality of each input / output port.

VDDIO

13.2.1

VDDIO is an independent IO supply rail input to DA9211 and DA9212 that can be assigned to the

power manager interface and to the GPIOs (see control PM_IF_V and GPI_V). The rail assignment

determines the IO voltage levels and logical thresholds (see also the Digital I/O Characteristics in

Table 8).

An integrated under voltage lockout circuit for the VDDIO prevents internal errors by disabling the

I2C communication when the voltage drops below VULO_IO. In that case the buck converters are also

disabled and can not be re-enabled (even via input port) until the VDDIO under-voltage condition has

been resolved. At the exit of the VDDIO under voltage condition an event E_UVLO_IO is generated

and the nIRQ line is driven active if the event is not masked.

The VDDIO under-voltage circuit monitors voltages relative to a nominal voltage of 1.8V. If a different

rail voltage is being used, the under-voltage circuit can be disabled via UVLO_IO_DIS.

Note that the maximum speed at 4-WIRE interface is only available if the selected supply rail is

greater than 1.6 V.

IC_EN

13.2.2

IC_EN is a general enable signal for DA9211 and DA9212, turning on and off the internal circuitry

(for example, the reference, the digital core, etc). Correct control of this port has a direct impact on

the quiescent current of the whole application. A low level of IC_EN allows the device to reach the

minimum quiescent current. The voltage at this pin is continuously sensed by a dedicated analogue

circuit.

The host processor will be allowed to start the communication with DA9211 and DA9212 through the

Control Interface and, for example to turn on the buck converters, a delay time of tEN after assertion

of the IC_EN pin. If the bucks are enabled via OTP (see BUCKA_EN and BUCKB_EN controls), they

will start up automatically after assertion of IC_EN.

The IC_EN signal shall be asserted and deasserted only when the VDD_IO supply is available and

its level is above the undervoltage threshold level VTH_UVLO_IO.

nIRQ

13.2.3

The nIRQ port indicates that an interrupt-causing event has occurred and that the event/status

information is available in the related registers. The nIRQ is an output signal that can either be

DA9211 Datasheet(PDF) 35 Page - Dialog Semiconductor

DA9211 Datasheet(HTML) 35 Page - Dialog Semiconductor

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

Datasheet Download

Link URL