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ADS7828E2K5 Datasheet(PDF) 11 Page - Texas Instruments |
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ADS7828E2K5 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 22 page  ADS7828 11 SBAS181C www.ti.com ADDRESS BYTE COMMAND BYTE The address byte is the first byte received following the START condition from the master device. The first five bits (MSBs) of the slave address are factory pre-set to 10010. The next two bits of the address byte are the device select bits, A1 and A0. Input pins (A1-A0) on the ADS7828 deter- mine these two bits of the device address for a particular ADS7828. A maximum of four devices with the same pre-set code can therefore be connected on the same bus at one time. The A1-A0 Address Inputs can be connected to VDD or digital ground. The device address is set by the state of these pins upon power-up of the ADS7828. The last bit of the address byte (R/W) defines the operation to be performed. When set to a ‘1’ a read operation is selected; when set to a ‘0’ a write operation is selected. Following the START condition the ADS7828 monitors the SDA bus, checking the device type identifier being transmit- ted. Upon receiving the 10010 code, the appropriate device select bits, and the R/W bit, the slave device outputs an acknowledge signal on the SDA line. MSB 65 4321 LSB SD C2 C1 C0 PD1 PD0 X X The ADS7828 operating mode is determined by a command byte which is illustrated above. SD: Single-Ended/Differential Inputs 0: Differential Inputs 1: Single-Ended Inputs C2 - C0: Channel Selections PD1 - 0: Power-Down Selection X: Unused See Table I for a power-down selection summary. See Table II for a channel selection control summary. MSB 654321 LSB 10010 A1 A0 R/W PD1 PD0 DESCRIPTION 0 0 Power Down Between A/D Converter Conversions 0 1 Internal Reference OFF and A/D Converter ON 1 0 Internal Reference ON and A/D Converter OFF 1 1 Internal Reference ON and A/D Converter ON CHANNEL SELECTION CONTROL SD C2 C1 C0 CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 COM 00 0 0 +IN –IN — — —— —— — 00 0 1 —— +IN –IN —— —— — 00 1 0 — ——— +IN –IN —— — 00 1 1 — ——— — — +IN –IN — 01 0 0 –IN +IN — — —— —— — 01 0 1 —— –IN +IN —— —— — 01 1 0 — ——— –IN +IN —— — 01 1 1 — ——— — — –IN +IN — 10 0 0 +IN — — — —— —— –IN 10 0 1 —— +IN —— — — — –IN 10 1 0 — ——— +IN —— — –IN 10 1 1 — ——— — — +IN —–IN 11 0 0 — +IN — — —— —— –IN 11 0 1 —— — +IN —— —— –IN 11 1 0 — ——— — +IN —— –IN 11 1 1 — ——— — — — +IN –IN TABLE II. Channel Selection Control Addressed by Command Byte. TABLE I. Power-Down Selection |
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