DA6021 datasheet(141/225 Pages) RENESAS

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DA6021

HIGHLY INTEGRATED POWER MANAGEMENT IC FOR

INTEL® ATOM™ Z3000 PROCESSOR

Company Confidential

Data Sheet

Version 3.A - Final

31-Jan-14

141 of 224

www.dialog-semiconductor.com

SYSTHERM1)

System Temp 2

(Pin:

SYSTHERM2)

ADCIN6

0.0V ..

VLP

Vin/VREF

T*1023

VSYS

(Pin: VSYS)

VSYS

2.5V ..

5.5V

YES

0.8*(VSYS

VLP)/VLP*

1023

0.8

Averaging output

current

ADCIN7

0.0V ..

VLP

YES

There is a pre-selection on

which rail the current

measurement will be

averaged

2*Vin/VRE

F*1023

Table 100: ADC Channel Overview

The ADC is used for temperature, current and voltage measurements. It is managed by the DA6021 ADC state

machine. The state machine performs ADC operations are, like regular readings of temperatures, current and

voltage, programmed in registers and may be modified by the SOC after boot and initialization. The ADC state

machine is an independent hardware engine which prevents the management of lengthy ADC transactions from

blocking time-critical power sequencing tasks.

The GPADC will be used to perform the following tasks:

1. Repeated (on-going) battery temperature acquisition (initiated via timer defined in THRMMONCTL)

2. Repeated (on-going) system temperature acquisition (initiated via timer defined in THRMMONCTL)

3. Repeated (on-going) PMIC die temperature acquisition (initiated via timer defined in THRMMONCTL)

4. Repeated (on-going) VR current acquisition (initiated via timer define VRIMONCTL)

5. SOC-requested acquisition of any GPADC channels (initiated via MANCONV0-1)

6. Thermal Alerts - triggering thermal interrupts when either battery temperatures, system temperatures or

PMIC temperature exceed the alert thresholds which are set in corresponding registers, asserts

PROCHOT_ B to SOC when enabled

7. Critical Temperature Shutdown

– if enabled, triggering system shutdown when either battery

temperatures, system temperatures or PMIC temperature exceed the critical temperature thresholds

which are set in corresponding registers

ADC Measurement Support

15.2.1

The analog ADC domain includes 2 voltage reference switches VREFB and VREFT. The reference switches for

the reference sources are enabled according vrefb/t_en signals.

There is another measurement function which allows comparing the input voltage against a fixed reference

voltage. Although this feature is implemented within the analog part of the ADC, it is completely independent

from all the scheduler based ADC functions. Because the comparison result may be put out via a pad, the PADS

block manages this function instead of the digital ADC block.

Preamplifier

15.2.2

A preamplifier is used for channels with an input range exceeding the ADC input range. The preamplifier is an

inverting amplifier so the ADC conversion values for these channels are bitwise inverted before use. For channel

3-7 it includes low pass filtering to reduce impact on platform noise.

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