AS1170 datasheet(32/53 Pages) OSRAM

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AS1170

Detailed description

Datasheet

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DS001083

• v2-00 • 2024-Feb-05

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The AS1170 can operate in the following two modes:

1. Slave receiver mode (write mode):

Serial data and clock are received through SDA and SCL. After each byte is received an

acknowledge bit is transmitted. START and STOP conditions are recognized as the

beginning and end of a serial transfer. Address recognition is performed by hardware after

reception of the slave address and direction bit. The slave address byte is the first byte

received after the master generates the START condition. The slave address byte contains

the 7-bit AS1170 address, which is 0x30 (or 0x32 if I²C address select pin is high), followed

by the direction bit (R/W), which, for a write, is 011. After receiving and decoding the slave

address byte the device outputs an acknowledge on the SDA line. After the AS1170

acknowledges the slave address + write bit, the master transmits a register address to the

AS1170. This sets the register pointer on the AS1170. The master may then transmit zero

or more bytes of data, with the AS1170 acknowledging each byte received. The address

pointer will increment after each data byte is transferred. The master generates a STOP

condition to terminate the data write.

2. Slave transmitter mode (read mode):

The first byte is received and handled as in the slave receiver mode. However, in this

mode, the direction bit indicates that the transfer direction is reversed. Serial data is

transmitted on SDA by the AS1170 while the serial clock is input on SCL. START and

STOP conditions are recognized as the beginning and end of a serial transfer. The slave

address byte is the first byte received after the master generates a START condition. The

slave address byte contains the 7-bit AS1170 address, which is 0x30 (or 0x32 if I²C

address select pin is high), followed by the direction bit (R/W), which, for a read, is 112.

After receiving and decoding the slave address byte the device outputs an acknowledge on

the SDA line. The AS1170 then begins to transmit data starting with the register address

pointed to by the register pointer. If the register pointer is not written to before the initiation

of a read mode the first address that is read is the last one stored in the register pointer.

The AS1170

must receive a “not acknowledge” to end a read.

11 The address for writing to the AS1170 is 60h = 01100000b ; or 64h if address select pin is high = 01100010b

12 The address for reading from the AS1170 is 61h = 01100001b ; or 65h if address select pin is high = 01100011b

AS1170 数据表(PDF) 32 Page - OSRAM GmbH

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