L9679P datasheet(41/279 Pages) STMICROELECTRONICS

41 / 279 page

DS11627 Rev 7

41/279

L9679P

Start-up and power control

278

Figure 14. ER discharge state diagram

6.5

ER CAP diagnostic

The L9679P IC contains a full integrated solution to check the connection, value and series

resistance of energy reserve capacitor independent from ER Cap leakage current and Boost

Voltage level.

6.5.1

ER CAP measurement

The IC contains two current generators used to charge and discharge the energy reserve

capacitor connected on ER pin. The simplified block diagram is shown in the figure below.

Figure 15. ER CAP measurement block diagram

To obtain an accurate ER CAP measurement, the VER voltage conversion must be required

when both current generators are off, namely no current flows through ER cap permits to

avoid ESR error contribution.

GAPGPS02258

power mode control

ER Discharge

[Active_mode = 1

(POWER_MODE_SHUTDOWN=1

AND

VER_VBATMON_COMP=1)]

AND

SYS_CTL(ER_CUR_EN[1:0]) = 10

AND

“ER CAP ESR DIAG not in progress”

/SLEEP_MODE = 0

ER_STATE = 1

SPI ER_CUR_EN[1:0]

(POWER_MODE_SHUTDOWN=1

AND

VER_VBATMON_COMP=0)

SSM_Reset

ER DISCHARGE

Start T1 350ms

ER DISCHARGE

OFF

Reset T1

POWER_MODE_SHUTDOWN=0

AND T1 timeout

ER DISCHARGE

STBY

Default SYS_CTL(ER_CUR_EN[1:0]) = 00 at

SSM_RESET = 1

/SLEEP_MODE = 0

ER_STATE = 1

SPI ER_CUR_EN[1:0]

POWER_MODE_SHUTDOWN

ER_Discharge OFF

VER_VBATMON_COMP = 1 when VER < VBATMON + Vver_vbatmon_th

ERBOOST

ER_CHARGE

ER_DISCHARGE

GNDA

ER Cap

ESR

GND_ADC

VER

CAPmes

ADC

10-bit

leak

GAPGPS02261

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