AN2512 datasheet(13/38 Pages) STMICROELECTRONICS

13 / 38 page

AN2512

Power calculation algorithm

13/38

Power calculation algorithm

3.1

STPM01 SPI Interface

The STPM01 SPI interface supports a simple serial protocol, which is implemented in order

to enable communication between a host system (microcontroller or PC) and the device.

Three tasks can be performed with this interface:

●

Remote resetting the device

●

Reading data records

●

Writing the Mode bits and the configuration bits (temporarily or permanently).

Four pins of the device are dedicated to this purpose: SCS, SYN, SCL, and SDA. SCS, SYN

and SCL are all input pins while SDA can be input or output according to whether the SPI is

in write or read mode.

The condition under which SCS, SYN and SCL inputs are set to high level determines the

idle state of the SPI interface and no data transfer occurs.

●

SCS: enables SPI operation when low. The microcontroller uses this pin to multiplex

the reading of the three devices.

●

SYN: when SCS is low, the SYN pin status selects whether the SPI is in read (SYN=1)

or write mode (SYN=0). When SCS is high and SYN is also high, the results of the

input or output data are transferred to the transmission latches.

●

SCL: is the clock pin of the SPI interface. This pin function is also controlled by the SCS

status. If SCS is low, SCL is the input of serial bit synchronization clock signal. When

SCS is high, SCL is also high determining the idle state of the SPI.

●

SDA: is the Data pin. If SCS is low, the operation of SDA is dependent on the status of

SYN pin. If SYN is high, SDA is the output of serial bit data (read mode). If SYN is low,

SDA is the input of serial bit data signal (write mode). If SCS is high, SDA is idle.

Table 3.

J1 connector pin description

Pin no.

Pin name

Functional description

VOTP

Power supply Input of +15.0 V during permanent write to OTP

cells

---

GND

Signal reference level 0V and power supply return

SDA

SPI Interface Data Signal

SCS

SPI Enable Signal

SCL

SPI Interface Clock Signal

---

SYN

SPI Interface Signal

---

10.

VDD

Power Out of +3.3 V

Up to 100 mA can be drawn from this pin

AN2512 Datasheet(PDF) 13 Page - STMicroelectronics

AN2512 Datasheet(HTML) 13 Page - STMicroelectronics

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

Datasheet Download

Link URL