ST25DV04K datasheet(39/197 Pages) STMICROELECTRONICS

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5.3

Energy harvesting (EH)

5.3.1

Energy harvesting registers

Table 34. EH_MODE access

I2C

Command

Type

Address

Type

Read Configuration (cmd code A0h) @02h

Write Configuration (cmd code A1h) @02h

R always, W if RF configuration security

session is open and configuration not locked

E2 = 1,

0002h

R always, W if I2C security

session is open

Table 35. EH_MODE

Bit

Name

Function

Factory Value

EH_MODE

0: EH forced after boot

1: EH on demand only

b7-b1

RFU

0000000b

Note:

Refer to Table 11. System configuration memory map for the EH_MODE register.

Table 36. EH_CTRL_Dyn access

I2C

Command

Type

Address

Type

Read Dynamic Configuration (cmd code ADh) @02h

Fast Read Dynamic Configuration (cmd code CDh) @02h

Write Dynamic Configuration (cmd code AEh) @02h

Fast Write Dynamic Configuration (cmd code CEh) @02h

b0: R always, W always

b1 - b7: RO

E2=0, 2002h

b0: R always, W always

b1-b7 : RO

Table 37. EH_CTRL_Dyn

Bit

Name

Function

Factory Value

EH_EN

0: Disable EH feature

1: Enable EH feature

EH_ON

0: EH feature is disabled

1: EH feature is enabled

FIELD_ON

0: RF field is not detected

1: RF field is present and ST25DVxxx may communicate in RF

Depending of power source

VCC_ON

0: No DC supply detected on VCC pin or Low Power Down mode is forced (LPD is high)

1: VCC supply is present and Low Power Down mode is not forced (LPD is low)

Depending of power source

b7-b4

RFU

Note:

Refer to Table 12. Dynamic registers memory map for the EH_CTRL_Dyn register.

5.3.2

Energy harvesting feature description

The usage of Energy Harvesting element can be defined in configuration register EH_MODE. When the Energy

harvesting mode is disabled or the RF field strength is not sufficient, the energy harvesting analog voltage output

V_EH is in High-Z state.

EH_MODE Static Register is used to define the Energy Harvesting default strategy after boot.

ST25DV04K ST25DV16K ST25DV64K

Energy harvesting (EH)

DS10925 - Rev 11

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